Pharmacognosy · Phytomedicine

Lemon Balm

Melissa officinalis L. — A lemon-scented Lamiaceae herb with over two millennia of medicinal use, backed by clinical evidence for anxiety, insomnia, herpes, and neuroprotection.

67 Primary Refs
16+ Properties
Leaf Parts Used
✦ Researched
Last Updated
Primary Source Wikiphyto · NCBI PubMed
Family Lamiaceae
✦ Researched · Multi-indication clinical evidence

Biological Overview

Melissa officinalis is a perennial herbaceous plant of the mint family (Lamiaceae) with a documented history spanning from Hippocrates to modern randomised controlled trials. Its principal clinical actions — anxiolytic, sedative, antiviral, and neuroprotective — are attributed to rosmarinic acid, flavonoids, triterpenoids, and a citral-rich essential oil.

Key ActivesRosmarinic acid, Citral, Ursolic acid
Primary TargetsGABA-T, AChE, TSH receptor
OriginMediterranean & W. Asia
PharmacopoeiaFrench Pharmacopoeia — List A
Botanical Classification

Taxonomy & Identification

Latin Name
Melissa officinalis L.
Family
Lamiaceae
Common Names
Lemon Balm, Melissa
French Name
Mélisse
English Name
Lemon Balm
Parts Used
Dried leaf & leafy stem
Origin
Mediterranean, Western Asia
Cultivation
Throughout Europe
Morphology & Distribution

Description & Habitat

Melissa officinalis is a herbaceous perennial standing 30–80 cm tall, sometimes occurring spontaneously in cool, shaded locations but widely cultivated throughout Europe. Its oval leaves are dark green, corrugated, and crenate-edged, with a highly agreeable lemon fragrance produced by the essential oil held in glandular trichomes on the leaf surface.

The flowers are borne in axillary cymes with a white corolla, occasionally spotted with pink. The plant belongs to the subfamily Nepetoideae within Lamiaceae and is closely related to other aromatic medicinal genera including Thymus, Salvia, and Ocimum. It thrives in well-drained soils under partial shade and can be harvested multiple times per season prior to full flowering, when essential oil concentration is highest.

Etymology

The genus name Melissa derives from the Greek word for "bee" (melissa), reflecting the plant's highly nectariferous flowers and strong attraction of honeybees. The epithet officinalis indicates its historic place on the official apothecary shelf.[1]

Morphological Profile
Height30–80 cm
Leaf shapeOval, corrugated, crenate
Leaf colourDark green
ScentStrong lemon (citrals)
FlowersWhite corolla, axillary cyme
LifecycleHerbaceous perennial
HabitatCool, shaded; well-drained soils

Harvesting Note

Drying method significantly affects essential oil composition. Convective drying alters citral content and overall volatile fraction. Cold or low-temperature drying is recommended to preserve pharmacological quality.[5]

Ethnobotany & Traditional Use

History & Tradition

Lemon balm is among the oldest medicinal plants in Western herbalism, with a continuous documented record from antiquity through the monastic tradition to contemporary phytomedicine. It was recommended for the heart and mind by Greek physicians and adopted by European monasteries as a key ingredient in their most celebrated restorative liqueurs.

4th Century BC

Hippocrates & Theophrastus

Hippocrates and Theophrastus both documented the plant's therapeutic properties. It was valued for its calming action on the heart and mind, and used to dispel dark thoughts and melancholy.

15th Century AD

Paracelsus

Paracelsus employed lemon balm as a "cordial" — a preparation intended to strengthen and stimulate cardiac function. This cardiac application would persist in European herbalism for centuries.

Medieval — Monastic Period

Chartreuse, Carmes & Bénédictins

Lemon balm featured prominently in the secret herbal liqueur recipes of the Chartreuse, Carmelite, and Benedictine monastic orders — traditions that survive commercially to this day.[2]

20th–21st Century

Modern Clinical Research

Randomised controlled trials have validated its use for anxiety, insomnia, Alzheimer's agitation, dysmenorrhoea, and topical herpes treatment, confirming much of the traditional empirical knowledge with molecular mechanisms.

Traditional Description

"Melissophyllon — leaf of the bee — a plant most beloved of bees, whose scent chases dark thoughts and fortifies the heart."

Etymology — Ref [1]

The name melissa (Greek: μέλισσα) means "honeybee" — a direct reference to the plant's exceptional ability to attract and sustain bee colonies. Beekeepers have historically rubbed hives with lemon balm to retain swarms and encourage new colonies to settle.

Pharmaceutical Preparations

Parts Used & Available Formulations

The dried leaf and leafy stem are the primary therapeutic materials; the essential oil is distilled from aerial parts and used separately in aromatherapy and topical preparations.

Dried Leaf & Aerial Parts

Dried leaf and leafy stem are the classical pharmacopoeial material. Used as infusions, dry extracts, EPS (standardised fresh plant extract), and mother tinctures. Dry extracts lack the volatile fraction but retain rosmarinic acid and flavonoids.

Essential Oil (Aromatherapy)

Steam-distilled from fresh aerial parts. Rich in citrals (geranial + neral), citronellal, and beta-caryophyllene. Used for topical antiviral applications (herpes), aromatherapy for agitation, and antispasmodic gastrointestinal preparations.

Standardised Dry Extract

Commercial preparations such as Elusanes® provide standardised dosing in capsule form. Mother tinctures (TM) are used for flexible dosing in individualised prescriptions. EPS formulations deliver the full phytochemical spectrum of the fresh plant.

Clinical Dosing

Usual Dosages

Dosages below are drawn from the Wikiphyto clinical monograph and cited clinical trials. Preclinical sedative threshold: 12.5–25 mg/kg in mice. Human clinical stress-reduction dose: 600 mg dry extract/day.[6]

Formulation Indication Dose Frequency Source
Dry extract (capsule) Anxiety / stress reduction 600 mg/day Daily (divided or single) [6]
EPS (standardised extract) Sedative / anxiolytic 5–10 mL/day 1–2 teaspoons daily [13]
Mother tincture (TM) Sedative / sleep onset 50 drops (evening) + 100 drops (bedtime) Evening & bedtime [13]
Standardised capsule (Elusanes®) Anxiety / sleep 1 capsule Morning & evening [13]
Essential oil (pure, topical) Herpes labialis Apply to lesions Several times daily [60]
1% EO cream Herpes labialis/genitalis Topical application Several times daily [60]
Biochemical Profile

Composition

Melissa officinalis contains a rich and pharmacologically active phytochemical matrix dominated by rosmarinic acid, flavonoids, and a citral-rich essential oil.

Whole Leaf

Essential oil0.05–0.3%; ~50% citrals (geranial + neral), citronellal (lemon aroma)
Volatile
Rosmarinic acid~4%; phenolic depside, major antioxidant and antiviral constituent; "Lamiaceae tannin"
4%
Chlorogenic & caffeic acidsHydroxycinnamic acid derivatives with anti-TSH activity
Phenolic
TriterpenoidsUrsolic acid, oleanolic acid, hydroxyoleanolic acid — GABAergic contributors
Triterpene
FlavonoidsLuteolin and quercetin derivatives — antioxidant and anti-inflammatory
Flavone
Uronic mucilagesWater-soluble polysaccharides contributing to demulcent action
Polysaccharide
Monoterpene glycosidesBitter principles; minor constituents with systemic bioactivity
Glycoside

Essential Oil

Geranial (Citral a)Trans-citral; 20–35% of EO; antiviral, antimicrobial, sedative
20–35%
Neral (Citral b)Cis-citral; 15–25% of EO; radical scavenger, anticancer candidate
15–25%
β-CaryophylleneSesquiterpene; 15–20%; anti-inflammatory, antifungal
15–20%
Germacrene-DSesquiterpene; 5–10%; antimicrobial activity
5–10%
Citronellal3–5%; anxiolytic activity in EO model studies[8]
3–5%
Isomenthone / MenthoneKetones; radical scavenging; antimicrobial
Ketone
Linalool / GeraniolMonoterpenic alcohols; calming, antifungal
Alcohol

Rosmarinic Acid — Key Active

GABAergic Anxiolytic

Inhibits GABA-transaminase, the enzyme that degrades GABA, thereby increasing inhibitory neurotransmission and producing anxiolytic and sedative effects.[11]

Antiviral Activity

Direct antiviral action against Herpes simplex types 1 and 2 — aqueous extracts containing rosmarinic acid prevent viral attachment to host cells.[17]

Antithyroid Action

Inhibits TSH receptor binding and thyroxine 5'-deiodinase activity; relevant to functional hyperthyroidism and Graves' disease management.[38]

Major Source in Lamiaceae

Melissa officinalis is one of the richest sources of rosmarinic acid (~4%) in the Lamiaceae family, exceeding rosemary and many other species in this phenolic.[3]

Plant Properties — Pharmacodynamics

Whole-plant biological activities with primary literature citations

16+ Properties Multiple RCTs Rosmarinic Acid · Citral

Sedative

Reduces stress significantly at 600 mg extract/day in humans. Sedative threshold in animal models from 12.5 mg/kg. Clinical pilot trials confirm reduced subjective anxiety and improved sleep quality.[6]

Anxiolytic

Demonstrated anxiolytic effects in both animal and human models.[7] Effect is potentiated in combination with valerian.[9] Aqueous extract of M. officinalis shows the strongest GABA-transaminase inhibition of all botanicals tested.[12]

Anticonvulsant

Hydroalcoholic extract demonstrates anticonvulsant activity in the pentylenetetrazole (PTZ) mouse model of convulsion, consistent with the GABAergic mechanism of action.[15]

Spasmolytic & Digestive

Lemon balm leaves exert spasmolytic and digestive-stimulating action comparable to benzodiazepines in terms of smooth muscle relaxation. Cholestatic benefits and anti-ulcer activity are also documented.[16]

Antiviral (Antiherpetic)

Aqueous extract inhibits HSV-1 and HSV-2 attachment to host cells in vitro, with topical application the most effective route.[17][18][19] Rosmarinic acid identified as the primary antiviral constituent.

Antioxidant & Antimicrobial

Significant radical scavenging and antibacterial activity demonstrated.[20][21] Most potent antimicrobial components are the monoterpenic aldehydes (neral/geranial, citronellal) and ketones (isomenthone, menthone).

Neuroprotective

Melissa officinalis demonstrates neuroprotective and neurological properties in research models, with potential relevance to neurodegenerative disease prevention.[23]

Anti-Alzheimer's

Improves symptoms of mild Alzheimer's disease and reduces agitation in multiple double-blind RCTs.[24][25][27] Inhibits acetylcholinesterase (AChE), increasing acetylcholine availability.

Sleep-Promoting

Promotes sleep in sleep-onset insomnia and may be used during benzodiazepine withdrawal.[28] Dose-dependent activity also shown in opioid withdrawal support.[29]

Antidepressive & Cognitive

Improves mood and cognitive performance in acute administration trials.[31][32] A systematic review and meta-analysis confirms antidepressant-like effects in clinical trials.[30] Memory enhancement confirmed in triple-herb RCT.[33]

Analgesic

Neurotropic action of hydroalcoholic extract demonstrates analgesic activity in mouse models.[34] Relevant to its traditional use in nervous pain and cardiac-origin discomfort.

Antithyroid / Anti-TSH

Inhibits thyroxine 5'-deiodinase (T4→T3 conversion) and TSH receptor binding.[35][36][38] Active constituents in Graves' disease: rosmarinic acid, ellagic acid, luteolin-7β-glucoside. May protect against PTZ-induced hypothyroidism.[43]

Anti-Chemotherapy Toxicity

Reduces chemotherapy-induced peripheral neuropathy, diarrhoea, nausea, and vomiting in cancer patients.[22] Randomised trial confirmed significant protective effects compared to placebo.

Anti-Ulcer & Choleretic

Demonstrated antiulcerogenic effects in gastrointestinal plant extract combination studies.[16] Choleretic action supports traditional use in biliary dyskinesias and hepatobiliary complaints.

Anticancer (Preclinical)

Citrals and citronellal show direct cytotoxic action on cancer cell lines in multiple human and murine tumour models.[50][51] Citral is a newly identified caspase-3 inducer in tumour cell lines.[63] Note: evidence is preclinical only.

AChE Inhibition

Melissa officinalis extract inhibits acetylcholinesterase activity, increasing central acetylcholine levels — a mechanism with potential relevance to Alzheimer's disease and cognitive impairment.[14]

Aromatherapy

Essential Oil Properties

The essential oil of Melissa officinalis has a distinct pharmacological profile from the whole plant extract, acting primarily via ligand-gated ion channel modulation, antiviral attachment inhibition, and radical scavenging.

Spasmolytic

Inhibits smooth muscle contractions induced by KCl, acetylcholine, and serotonin in dose-dependent fashion — comparable efficacy to papaverine on rat ileum.[44]

Antioxidant & Free Radical Scavenging

Significant antioxidant activity linked to neral, geranial, citronellal, isomenthone, and menthone. The cis/trans citral pair (geometric isomers) are the primary radical scavenging agents.[45]

Analgesic (EO)

The essential oil demonstrates anti-nociceptive activity in both acute and chronic pain models, supporting its use in pain-associated indications including neuropathy and gut pain.[46]

Antiviral — Herpes & Influenza

Essential oil active against HSV-1 and HSV-2 by disrupting enveloped viral particles.[47][48] Also active against avian influenza A (H9N2) in comparative studies with oseltamivir.[49]

Antibacterial & Antifungal

Activity documented against Shigella sp. (antibacterial) and Trichophyton sp. (antifungal) by Mimica-Dukić and colleagues. Relevant for dermal and gastrointestinal infectious conditions.

Calming & Anti-Agitation

Aromatherapy with lemon balm EO reduces agitation even in severe dementia patients in double-blind placebo-controlled trials.[55][53][54] Acts on nicotinic and muscarinic acetylcholine receptors and GABA-A channels.

Anticancer (Preclinical)

Essential oil shows antitumour and antioxidant activities in multiple human and mouse cell models.[52] Citrals and citronellal are the principal cytotoxic components; evidence remains preclinical.

Clinical Use

Clinical Indications

Whole-plant phytotherapy indications are the most extensively studied; EO aromatherapy and topical applications form a complementary evidence base for specific conditions.

Neuropsychiatric & Sleep
Phytotherapy — Whole Plant
  • Anxiety & nervousness — Demonstrated in clinical studies; effect potentiated with valerian.[56]
  • Sleep-onset insomnia — Promotes sleep onset; useful in benzodiazepine and opioid withdrawal.[28]
  • Depression — Antidepressive activity confirmed in systematic review and meta-analysis.[30]
  • Mild Alzheimer's disease — Improves cognition and reduces agitation in double-blind RCTs.[24]
  • Cognitive enhancement — Mood and memory improvement in healthy volunteers via muscarinic/nicotinic receptor modulation.[32]
  • Psychovegetative cardiac complaints — Traditionally and clinically used for palpitations of nervous origin.
Gastrointestinal & Hormonal
Phytotherapy — Whole Plant
  • Functional GI complaints — Bloating, spasms, and digestive discomfort via spasmolytic and digestive-stimulating action.
  • Biliary pain — Choleretic action; bile flow stimulation via rosmarinic acid and Lamiaceae tannins.
  • Dysmenorrhoea & PMS — Significant symptom reduction in RCT of adolescent girls.[57]
  • Hyperthyroidism (Graves' disease) — Inhibits TSH-stimulated adenylate cyclase and anti-TSH immunoglobulin binding.[58]
  • Hypertonic dyskinesia — Spasmolytic action applicable to hyperkinetic bowel disorders.
  • Chemotherapy support — Reduces peripheral neuropathy, nausea, and diarrhoea in cancer patients.[22]
Antiviral — Topical & Systemic
Phytotherapy & Aromatherapy
  • Herpes labialis (cold sores) — 1% EO cream reduces healing time and recurrence interval; aqueous extract inhibits HSV attachment.[60]
  • Herpes genitalis — Topical EO application documented in vitro and in clinical use.[48]
  • Bacterial infections (GI) — EO active against gut pathogens including Shigella sp.; relevant in irritable bowel syndrome.[59]
  • Fungal skin infections — Activity against Trichophyton sp. supports topical use in dermatophytosis.
Essential Oil Specific Indications
Aromatherapy
  • Hysteria & nervous depression — Classic EO aromatherapy application for acute emotional dysregulation.
  • Irritable bowel syndrome — Spasmolytic action of EO on intestinal smooth muscle; comparative antibacterial data.[59]
  • Agitation in dementia — Double-blind RCT confirms significant anti-agitation effects with aromatherapy.[55]
  • Herpes labialis & genitalis — Direct topical application of pure EO to active lesions several times daily.[60]
Pharmacology

Known & Presumed Mode of Action

The pharmacological profile of Melissa officinalis involves multiple molecular targets, with GABAergic potentiation and cholinesterase inhibition as the best-characterised mechanisms.

GABA-T Inhibition (Anxiolytic / Sedative)

Rosmarinic acid and triterpenoids (ursolic acid, oleanolic acid) inhibit GABA-transaminase, the catabolic enzyme for GABA. This increases GABAergic tone in the CNS — the same target as benzodiazepines and anticonvulsant drugs. Aqueous extract of M. officinalis shows the strongest GABA-T inhibition among all botanical extracts tested.[11][12][61]

AChE Inhibition (Cognitive / Alzheimer's)

Melissa officinalis extract inhibits acetylcholinesterase, increasing synaptic acetylcholine concentrations. This mechanism underpins its cognitive-enhancing properties and is the basis for clinical trials in Alzheimer's disease.[13][14] The extract also modulates muscarinic and nicotinic acetylcholine receptors directly.[32]

Antiviral Attachment Inhibition

Rosmarinic acid and the aqueous extract prevent herpes simplex virus attachment to cell surface receptors, inhibiting the first step of viral infection. This mechanism is most effective as a topical preparation. The EO disrupts the viral lipid envelope directly, providing a complementary antiviral route.[17][19]

TSH Receptor & Deiodinase Inhibition (Thyroid)

Cinnamic acid derivatives (caffeic acid, rosmarinic acid, chlorogenic acid, ellagic acid) inhibit TSH membrane receptor binding and suppress thyroxine 5'-deiodinase — the enzyme catalysing T4→T3 conversion.[38][65] In Graves' disease, the extract additionally inhibits anti-TSH-receptor immunoglobulin binding, reducing cAMP stimulation.[39]

Radical Scavenging (Antioxidant)

Free radical scavenging attributed to the EO components neral, geranial, citronellal, isomenthone, and menthone — with the cis/trans citral pair acting as the primary active species. Aqueous and ethanolic extracts also show antiproliferative and antibacterial activities linked to rosmarinic acid and flavonoids.[20]

Anticancer Mechanism — Caspase-3 Induction (Preclinical)

Citrals and citronellal exert direct cytotoxic effects on cancer cell lines. Citral has been identified as a new inducer of caspase-3 in tumour cell lines, suggesting apoptotic pathway activation.[62][63][64] This evidence is preclinical only and should not be extrapolated to clinical cancer treatment.

Preparation Guide

Common Formulations

01

EPS — Standardised Fresh Plant Extract

Melissa officinalis EPS: 5 to 10 mL per day (1–2 teaspoons). Delivers the full phytochemical spectrum including the volatile fraction absent from dry extracts.

02

Mother Tincture (T.M.)

Melissa officinalis T.M.: 50 drops in the evening before meals, and 100 drops at bedtime. Flexible individualised dosing; suitable for benzodiazepine tapering support.

03

Standardised Dry Extract — Elusanes®

1 capsule morning and evening. Dry extracts lack the volatile (essential oil) fraction but retain rosmarinic acid and non-volatile phenolics at standardised concentrations.

04

Essential Oil — Topical Application

Pure lemon balm EO applied directly to herpes lesions several times per day. A 1% cream formulation is the standard for clinical trials of herpes labialis. Pure EO should not be used undiluted on large skin areas.

Legal Status & Notes

Regulatory Status

French Pharmacopoeia — List A

Melissa officinalis leaf and flowering top are listed in the French Pharmacopoeia (Pharmacopée Française) on List A — monographed medicinal plant materials with established pharmaceutical identity and quality criteria.

EMA / HMPC Recognition

Lemon balm is recognised as a traditional herbal medicinal product in the European Union for relief of mild symptoms of mental stress and to aid sleep, based on established traditional use.

Dry Extract Note

Dry extract preparations (standardised capsules) are manufactured without the essential oil fraction. When the volatile fraction is clinically relevant (e.g. antiviral topical use), the EO or full fresh plant preparations should be preferred over dry extracts.

Clinical Safety

Safety & Precautions

Lemon balm is generally well tolerated. Key cautions relate to thyroid function interference and potential CNS depressant potentiation.

⚠️

Adverse Effects & Toxicity

  • Well tolerated up to 500 mg rosmarinic acid: A pharmacokinetics and tolerability RCT confirmed safety at doses up to 500 mg of rosmarinic acid equivalent without adverse events.[66]
  • Rare dependence report: A single case report of possible dependence/withdrawal has been documented.[67] Clinical significance is unclear; the case remains isolated in the literature.
  • Thyroid function effects: Aqueous extracts may inhibit T4→T3 conversion and TSH receptor function; clinically relevant in people with thyroid disorders.[38]
  • Pregnancy: No contraindications identified; dose reduction by half is recommended as a precautionary measure.
🚫

Contraindications & Drug Interactions

  • Thyroid medications: May interfere with levothyroxine, antithyroid drugs, or iodine-based treatments. Use with caution in patients with hypothyroidism or on thyroid replacement therapy.[38]
  • CNS depressants (pharmacodynamic): As a GABAergic agent, lemon balm may theoretically potentiate benzodiazepines, barbiturates, sedative antihistamines, and other CNS depressants. Supervise concurrent use.
  • Pharmacokinetic interactions: No data currently available. No CYP enzyme inhibition data have been reported.
  • Hyperthyroidism caution: Beneficial in Graves' disease but theoretical risk of worsening hypothyroid states — monitor thyroid function in borderline or treated patients.
Clinical Disclaimer: This monograph is for educational and professional reference only. It does not constitute medical advice, diagnosis, or treatment guidance. Melissa officinalis preparations should be used under the supervision of a qualified healthcare provider. The Health Reference reviews content against current primary literature.
Common Questions

Frequently Asked Questions

What is lemon balm (Melissa officinalis) used for?
Lemon balm is clinically used for anxiety, insomnia, nervous restlessness, functional gastrointestinal complaints (spasms, bloating), dysmenorrhoea, premenstrual syndrome, and topically for herpes labialis. It is also studied for mild Alzheimer's disease symptom management and functional hyperthyroidism, particularly Graves' disease.
How does lemon balm work for anxiety and sleep?
Melissa officinalis exerts its anxiolytic and sedative effects primarily by inhibiting GABA-transaminase (GABA-T), the enzyme that degrades the inhibitory neurotransmitter GABA. This elevates GABAergic tone in the brain — the same molecular pathway targeted by benzodiazepine-class drugs. The active constituents responsible are rosmarinic acid and the triterpenoids ursolic acid and oleanolic acid. A clinical pilot trial showed significant improvements in both anxiety and sleep quality at 600 mg of dry extract per day.
Is lemon balm effective against herpes (cold sores)?
Yes. Both the aqueous extract and the essential oil of Melissa officinalis show antiviral activity against Herpes simplex virus type 1 and type 2 in vitro, primarily by inhibiting viral attachment to host cells. Topical application of a 1% cream formulation has been evaluated in randomised controlled trials for recurrent herpes labialis, showing reduced healing time and symptom severity. Pure essential oil can also be applied directly to lesions several times per day.
Does lemon balm affect the thyroid gland?
Yes, and this interaction requires careful attention. Melissa officinalis contains constituents — primarily rosmarinic acid, caffeic acid, and chlorogenic acid — that inhibit thyroxine 5'-deiodinase (reducing T4→T3 conversion) and directly block TSH receptor binding. In Graves' disease hyperthyroidism, the extract additionally suppresses anti-TSH-receptor immunoglobulin activity. This makes it potentially beneficial in functional hyperthyroidism, but people with hypothyroidism or those taking levothyroxine or antithyroid drugs should consult a healthcare provider before using lemon balm regularly.
Can lemon balm help with Alzheimer's disease?
Multiple clinical trials support its use in mild-to-moderate Alzheimer's disease. A double-blind, placebo-controlled RCT by Akhondzadeh et al. (2003) demonstrated significant improvements in cognitive function and reduced agitation. A 2020 study confirmed safety and potential efficacy in slowing Alzheimer's progression. Mechanistically, the extract inhibits acetylcholinesterase — the same enzyme targeted by donepezil and rivastigmine — and may also have neuroprotective effects through rosmarinic acid.
What are the active compounds in lemon balm?
The principal active constituents of Melissa officinalis are: rosmarinic acid (~4%), one of the richest sources in the Lamiaceae family; flavonoids (luteolin and quercetin derivatives); triterpenoids (ursolic acid, oleanolic acid); monoterpene glycosides; and uronic acid mucilages. The essential oil (0.05–0.3% of the dry leaf) is dominated by citral isomers — geranial (20–35%) and neral (15–25%) — plus citronellal, beta-caryophyllene (15–20%), and monoterpenic alcohols linalool and geraniol.
What is the recommended dose of lemon balm?
Clinical dosing from published trials and the Wikiphyto monograph: Dry extract for anxiety/stress — 600 mg/day. EPS (standardised fresh plant extract) — 5–10 mL per day. Mother tincture (T.M.) — 50 drops before the evening meal and 100 drops at bedtime. Standardised dry extract capsule (e.g. Elusanes®) — 1 capsule morning and evening. Pure essential oil — applied topically to herpes lesions several times daily. 1% EO cream — for herpes labialis treatment in clinical trial protocols.
Is lemon balm safe during pregnancy?
No specific contraindications to lemon balm have been established during pregnancy. The Wikiphyto clinical monograph recommends reducing doses by half as a precautionary measure. As with all herbal preparations during pregnancy, use should be discussed with a qualified healthcare provider, particularly given the plant's thyroid-modulating and GABAergic activities.
Can lemon balm interact with medications?
Two interaction categories are relevant. Pharmacodynamic interactions: lemon balm potentiates GABAergic CNS depressants (benzodiazepines, barbiturates, sedative antihistamines, alcohol) and may interact with thyroid medications (levothyroxine, carbimazole, propylthiouracil) by influencing thyroid hormone conversion and TSH signalling. Pharmacokinetic interactions: no data are currently available regarding CYP enzyme inhibition or induction. Patients on CNS-active or thyroid medications should consult a healthcare provider before use.
Is lemon balm the same as melissa?
Yes. Lemon balm and melissa both refer to Melissa officinalis L. The name melissa comes from the Greek word for bee (μέλισσα), reflecting the plant's highly nectariferous flowers. In French it is called mélisse. It should not be confused with lemon verbena (Aloysia citrodora), lemon thyme (Thymus citriodorus), or lemon myrtle (Backhousia citriodora) — all unrelated species with similar citrus scent profiles but distinct pharmacological properties.
Why does lemon balm smell like lemon?
The characteristic lemon scent of Melissa officinalis comes from its essential oil, which is rich in citral isomers — geranial (citral a, trans) and neral (citral b, cis) — which together can constitute 20–60% of the volatile fraction, sometimes up to 90% in high-quality material. Citronellal adds a secondary citrus note. These aldehydes are also responsible for the plant's antiviral and antimicrobial activities, making the aromatic quality a proxy indicator of pharmacological potency.
Can lemon balm be used to support cancer treatment?
The evidence for direct anticancer activity is preclinical only. Citrals and citronellal have shown cytotoxic effects on cancer cell lines in laboratory studies, and citral has been identified as an inducer of caspase-3 (an apoptosis marker) in tumour cells. A published RCT does support its use in reducing chemotherapy-induced peripheral neuropathy, nausea, and diarrhoea in cancer patients. Lemon balm should not be used as a substitute for cancer treatment, but adjunctive use to reduce chemotherapy side effects shows clinical promise.
Primary Literature

Bibliography

1.Marty-Dufaut J. Le potager du Moyen-Âge. Ed. Autres Temps, 2006. ↑
2.Pineau S. Mécanismes d'action cellulaires et physiologiques des composés de la mélisse et de la valériane. Thèse Pharmacie, Université d'Angers, 2012. Full text → ↑
3.Lamaison JL, Petitjean-Freytet C, Carnat A. Rosmarinic acid and antioxidant activity of medicinal Apiaceae, Borraginaceae and Lamiaceae. Ann Pharm Fr. 1990;48(2):103–8. PubMed PMID:2291599 → ↑
4.Lamaison JL, Petitjean-Freytet C, Carnat A. Medicinal Lamiaceae with antioxidant properties, a potential source of rosmarinic acid. Pharm Acta Helv. 1991;66(7):185–8. PubMed PMID:1763093 → ↑
5.Argyropoulos D, Müller J. Changes of essential oil content and composition during convective drying of lemon balm. Ind Crops Prod. 2014;52:118–124. DOI → ↑
6.Kennedy DO, Little W, Scholey AB. Attenuation of laboratory-induced stress in humans after acute administration of Melissa officinalis. Psychosom Med. 2004;66(4):607–13. PubMed PMID:15272110 → ↑
7.Taiwo AE et al. Anxiolytic and antidepressant-like effects of Melissa officinalis in rats. Indian J Pharmacol. 2012;44(2):189–192. PMC Full text → ↑
8.Stojanović NM et al. The potential of lemon balm essential oil as an anti-anxiety agent — is citronellal the activity carrier? J Ethnopharmacol. 2023;314:116661. PubMed PMID:37207879 → ↑
9.Kennedy DO, Little W, Haskell CF, Scholey AB. Anxiolytic effects of a combination of Melissa officinalis and Valeriana officinalis during laboratory induced stress. Phytother Res. 2006;20(2):96–102. PubMed PMID:16444660 → ↑
10.Ibarra A et al. Effects of chronic administration of Melissa officinalis extract on anxiety-like reactivity and circadian activities in mice. Phytomedicine. 2010;17(6):397–403. PubMed PMID:20171069 → ↑
11.Awad R et al. Bioassay-guided fractionation of lemon balm using an in vitro measure of GABA transaminase activity. Phytother Res. 2009;23(8):1075–81. PubMed PMID:19165747 → ↑
12.Awad R et al. Effects of traditionally used anxiolytic botanicals on enzymes of the GABA system. Can J Physiol Pharmacol. 2007;85(9):933–942. DOI → ↑
13.Cases J et al. Pilot trial of Melissa officinalis leaf extract in volunteers with mild-to-moderate anxiety and sleep disturbances. Med J Nutr Metab. 2011;4(3):211–218. PubMed PMID:22207903 → ↑
14.Dos Santos-Neto LL et al. The use of herbal medicine in Alzheimer's disease — a systematic review. Evid Based Complement Alternat Med. 2006;3(4):441–5. PubMed PMID:17173107 → ↑
15.Ebrahimi Hariry R. Anticonvulsant effects of hydroalcoholic extract of Melissa officinalis on PTZ model of convulsion in mice. J Med Plants Res. 2011;5(16):3803–3809. Full text → ↑
16.Khayyal MT et al. Antiulcerogenic effect of some gastrointestinally acting plant extracts and their combination. Arzneimittelforschung. 2001;51(7):545–53. PubMed PMID:11505785 → ↑
17.Astani A, Reichling J, Schnitzler P. Melissa officinalis extract inhibits attachment of herpes simplex virus in vitro. Chemotherapy. 2012;58(1):70–7. PubMed PMID:22377592 → ↑
18.Mazzanti G et al. Inhibitory activity of Melissa officinalis extract on Herpes simplex virus type 2 replication. Nat Prod Res. 2008;22(16):1433–40. PubMed PMID:19023806 → ↑
19.Nolkemper S et al. Antiviral effect of aqueous extracts from Lamiaceae against HSV type 1 and type 2 in vitro. Planta Med. 2006;72(15):1378–82. PubMed PMID:17091431 → ↑
20.Canadanović-Brunet J et al. Radical scavenging, antibacterial, and antiproliferative activities of Melissa officinalis extracts. J Med Food. 2008;11(1):133–43. PubMed PMID:18361749 → ↑
21.Mimica-Dukic N et al. Antimicrobial and antioxidant activities of Melissa officinalis essential oil. J Agric Food Chem. 2004;52(9):2485–9. PubMed PMID:15113145 → ↑
22.Ehsani Z et al. Effect of Melissa officinalis on Chemotherapy-Induced Peripheral Neuropathy in Cancer Patients: A Randomized Trial. Int J Hematol Oncol Stem Cell Res. 2024;18(2):165–173. PubMed PMID:38868804 → ↑
23.López V et al. Neuroprotective and neurological properties of Melissa officinalis. Neurochem Res. 2009;34(11):1955–1961. PubMed PMID:19760174 → ↑
24.Akhondzadeh S et al. Melissa officinalis extract in the treatment of patients with mild to moderate Alzheimer's disease: a double blind, randomised, placebo controlled trial. J Neurol Neurosurg Psychiatry. 2003;74:863–866. PMC Full text → ↑
25.Burns A et al. A Double-Blind Placebo-Controlled Randomized Trial of Melissa officinalis Oil and Donepezil for Agitation in Alzheimer's Disease. Dement Geriatr Cogn Disord. 2011;31:158–164. DOI: 10.1159/000324438 ↑
26.Mahboubi M. Melissa officinalis and rosmarinic acid in management of memory functions and Alzheimer disease. Asian Pac J Trop Biomed. 2019;9(2):47–52. ↑
27.Noguchi-Shinohara M et al. Safety and efficacy of Melissa officinalis extract containing rosmarinic acid in the prevention of Alzheimer's disease progression. Sci Rep. 2020;10(1):18627. PubMed PMID:33122694 → ↑
28.Evangelidis N. Could herbal medicine alternatives reduce overuse of benzodiazepines in older adults? Thoughts on the EMPOWER trial. Aust J Herbal Med. 2015;27(3):97. ↑
29.Ebrahimie M et al. A Review Study on the Effect of Iranian Herbal Medicines on Opioid Withdrawal Syndrome. J Evid Based Complement Altern Med. 2015;20(4):302–9. PubMed PMID:25818661 → ↑
30.Ghazizadeh J et al. The effects of lemon balm on depression and anxiety in clinical trials: A systematic review and meta-analysis. Phytother Res. 2021;35(12):6690–6705. PubMed PMID:34449930 → ↑
31.Kennedy DO et al. Modulation of mood and cognitive performance following acute administration of Melissa officinalis. Pharmacol Biochem Behav. 2002;72(4):953–64. PubMed PMID:12062586 → ↑
32.Kennedy DO et al. Modulation of mood and cognitive performance following Melissa officinalis with CNS nicotinic and muscarinic receptor-binding properties. Neuropsychopharmacology. 2003;28(10):1871–81. PubMed PMID:12888775 → ↑
33.Perry NSL et al. A randomised double-blind placebo-controlled pilot trial of combined sage, rosemary and melissa on memory enhancement. Phytomedicine. 2018;39:42–48. PubMed PMID:29433682 → ↑
34.Soulimani R et al. Neurotropic action of the hydroalcoholic extract of Melissa officinalis in the mouse. Planta Med. 1991;57(2):105–9. PubMed PMID:1891490 → ↑
35.Sourgens H et al. Antihormonal Effects of Plant Extracts. TSH- and Prolactin-Suppressing Properties of Lithospermum officinale and other plants. Planta Med. 1982;45(6):78–86. PubMed PMID:7202226 → ↑
36.Auf'mkolk M et al. Inhibition by Certain Plant Extracts of the Binding and Adenylate Cyclase Stimulatory Effect of Bovine Thyrotropin in Human Thyroid Membranes. Endocrinology. 1984;115(2):527–534. PubMed PMID:6745167 → ↑
37.Rafieian-Kopaei M. Thyroid diseases: Pathophysiology and new hopes in treatment with medicinal plants and natural antioxidants. Int J Green Pharm. 2018;12(03). PDF → ↑
38.Auf'mkolk M et al. Antihormonal effects of plant extracts: iodothyronine deiodinase of rat liver inhibited by plant extracts and secondary metabolites. Horm Metab Res. 1984;16(4):188–92. PubMed PMID:6724503 → ↑
39.Santini F et al. In vitro assay of thyroid disruptors affecting TSH-stimulated adenylate cyclase activity. J Endocrinol Invest. 2003;26:950–955. DOI → ↑
40.Parimal KP et al. Herbal anti-thyroid drugs: An overview. Res J Pharm Technol. 2020;13(10):5045–5051. ↑
41.Auf'mkolk M et al. Extracts of certain plants inhibit the receptor-binding and biological activity of Graves' immunoglobulins. Endocrinology. 1985;116(5):1687–1693. DOI → ↑
42.Mannaa FA et al. Influence of Melissa officinalis methanolic extract on hyperthyroidism in a rat model. 2021;20(2):134–144. ↑
43.Abdel-Aziz M. Therapeutic potential of Melissa officinalis on male Wistar albinos with induced-hypothyroidism. Al-Azhar J Pharm Sci. 2018;57(1):1–17. ↑
44.Sadraei H, Ghannadi A, Malekshahi K. Relaxant effect of essential oil of Melissa officinalis and citral on rat ileum contractions. Fitoterapia. 2003;74(5):445–52. PubMed PMID:12837359 → ↑
45.Mimica-Dukic N et al. Antimicrobial and antioxidant activities of Melissa officinalis essential oil. J Agric Food Chem. 2004;52(9):2485–9. [Same study as ref 21] PubMed PMID:15113145 → ↑
46.Chindo BA et al. Evaluation of the anti-nociceptive profile of essential oil from Melissa officinalis in acute and chronic pain models. J Ethnopharmacol. 2024;321:117500. PubMed PMID:38030022 → ↑
47.Schnitzler P et al. Melissa officinalis oil affects infectivity of enveloped herpesviruses. Phytomedicine. 2008;15(9):734–40. PubMed PMID:18693101 → ↑
48.Allahverdiyev A et al. Antiviral activity of the volatile oils of Melissa officinalis against Herpes simplex virus type-2. Phytomedicine. 2004;11(7–8):657–61. PubMed PMID:15636181 → ↑
49.Pourghanbari G et al. Antiviral activity of oseltamivir and Melissa officinalis essential oil against avian influenza A (H9N2). VirusDis. 2016;27:170–178. DOI → ↑
50.Osato S, Oda K, Sato F. Direct action of citral and citronellal on cancer cells. C R Seances Soc Biol Fil. 1954;148(7–8):768–9. ↑
51.Osato S, Mori H, Morita M. Experiments on chemotherapeutic treatment of carcinoma with citral and citronellal combined with PCMB. Tohoku J Exp Med. 1961;75:223–33. PubMed PMID:14482444 → ↑
52.de Sousa AC et al. Melissa officinalis essential oil: antitumoral and antioxidant activities. J Pharm Pharmacol. 2004;56(5):677–681. ↑
53.Abuhamdah S et al. Pharmacological profile of an essential oil from Melissa officinalis with anti-agitation properties: focus on ligand-gated channels. J Pharm Pharmacol. 2008;60(3):377–84. PubMed PMID:18284819 → ↑
54.Huang L et al. Pharmacological profile of essential oils from Lavandula angustifolia and Melissa officinalis with anti-agitation properties: ligand-gated channels. J Pharm Pharmacol. 2008;60(11):1515–22. PubMed PMID:18957173 → ↑
55.Ballard CG et al. Aromatherapy as a safe and effective treatment for agitation in severe dementia: double-blind, placebo-controlled trial with Melissa. J Clin Psychiatry. 2002;63(7):553–8. PubMed PMID:12143909 → ↑
56.Cases J et al. Pilot trial of Melissa officinalis leaf extract in volunteers with mild-to-moderate anxiety and sleep disturbances. Mediterr J Nutr Metab. 2011;4:211–218. Full text → ↑
57.Akbarzadeh M et al. Effect of Melissa officinalis Capsule on the Intensity of Premenstrual Syndrome Symptoms in High School Girls. Nurs Midwifery Stud. 2015;4(2):e27001. PMC Full text → ↑
58.Kaplan D, Dosiou C. Two Cases of Graves' Hyperthyroidism Treated With Homeopathic Remedies Containing Lycopus spp. and Melissa officinalis. J Endocr Soc. 2021;5(Suppl 1):A971. ↑
59.Thompson A et al. Antibacterial activity of essential oils and herbal extracts — new treatments for irritable bowel syndrome. BMC Complement Altern Med. 2013;13:338. Abstract → ↑
60.Koytchev R, Alken RG, Dundarov S. Balm mint extract (Lo-701) for topical treatment of recurring herpes labialis. Phytomedicine. 1999;6(4):225–30. PubMed PMID:10589440 → ↑
61.Awad R et al. Bioassay-guided fractionation of lemon balm using an in vitro measure of GABA transaminase activity. Phytother Res. 2009;23(8):1075–81. [Same study as ref 11] PubMed PMID:19165747 → ↑
62.Osato S. Chemotherapy of human carcinoma with citronellal and citral. Tohoku J Exp Med. 1965;86(2):102–47. ↑
63.Dudai N et al. Citral is a new inducer of caspase-3 in tumor cell lines. Planta Med. 2005;71(5):484–8. ↑
64.Osato S, Oda K, Sato F. Direct action of citral and citronellal on cancer cells. C R Seances Soc Biol Fil. 1954;148(7–8):768–9. [Same study as ref 50] ↑
65.Auf'mkolk M et al. The active principles of plant extracts with antithyrotropic activity: oxidation products of 3,4-dihydroxycinnamic acid derivatives. Endocrinology. 1985;116(5):1677–1686. PubMed PMID:3987612 → ↑
66.Noguchi-Shinohara M et al. Pharmacokinetics, Safety and Tolerability of Melissa officinalis Extract containing Rosmarinic Acid in Healthy Individuals: A Randomized Controlled Trial. PLoS ONE. 2015;10(5):e0126422. ↑
67.Demirci K et al. Does Melissa Officinalis Cause Withdrawal or Dependence? Med Arch. 2015;69(1):60–61. ↑

Additional Clinical & Reference Literature

Wichtl M, Anton R. Plantes thérapeutiques : Tradition, pratique officinale, science et thérapeutique. Ed. Tec & Doc. Cachan. 1999. p. 355.
Pineau S. Mécanismes d'action cellulaires et physiologiques des composés de la mélisse (Melissa officinalis L.) et de la valériane (Valeriana officinalis L.). Thèse Pharmacie, Angers, 2012.
Shiozawa S, Hashimoto T. Clinical effect of d-Rhodinic acid and d-Citronellal on pulmonary tuberculosis. Niigata Igakkai Zasshi. 1962;76:810–9.