Phytomedicine · Evidence-Based Guide
An independent, evidence-based reference for herbal medicine. Every guide draws on primary peer-reviewed literature — pharmacology, dosage, and safety data you can actually use.
About This Encyclopedia
Every plant guide here is built from primary peer-reviewed evidence — randomised controlled trials, meta-analyses, and pharmacokinetic studies — translated into clear, actionable information. Traditional use is noted for context but never presented as proof of efficacy.
Each guide covers active constituent profiles, how the plant works in the body, what the clinical evidence actually shows for benefits and safety, proven dosage ranges, drug interactions to be aware of, and who should avoid it. The reference count on each card reflects the primary clinical literature cited in the full guide.
Whether you are researching ashwagandha for stress and anxiety, milk thistle for liver health and detox, turmeric for inflammation, bacopa monnieri for memory, rhodiola rosea for fatigue, lemon balm for sleep, black elderberry for immune support, nigella sativa for inflammation, rosemary for cognitive function, ginger for nausea and inflammation, fenugreek for blood sugar and testosterone, german chamomile for anxiety and sleep, valerian root for insomnia, echinacea for cold and flu immunity, ginkgo biloba for memory and circulation, andrographis for upper respiratory infections, cayenne pepper for pain relief, dandelion for liver and diuretic support, guarana for energy and focus, or spirulina for immunity and nutrition — every recommendation here is grounded in the same clinical evidence used by integrative medicine practitioners worldwide.
Most Researched Plants
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Andrographis paniculata (Burm.f.) Nees
Known as the "King of Bitters," andrographis is among the most clinically validated herbs for upper respiratory infections. Andrographolide — a potent NF-κB inhibitor — reduces cold duration, severity, and frequency across multiple RCTs. Also studied for antiviral activity against influenza and SARS-CoV-2.
Withania somnifera (L.) Dunal
The most clinically studied adaptogen for stress and anxiety relief. Multiple RCTs confirm significant cortisol reduction, improved sleep quality, and anxiolytic effects. Withanolides are the primary active constituents driving these benefits.
Astragalus membranaceus (Fisch.) Bge.
Known as Huang Qi in traditional Chinese medicine, astragalus root has been used for centuries as a tonic against weakness and infection, and is now studied for immunomodulant, adaptogenic, and telomerase-activating astragalosides.
Bacopa monnieri (L.) Wettst.
The leading herbal nootropic for memory and cognitive performance. Bacosides inhibit acetylcholinesterase and consistently improve delayed recall in 12-week RCTs. Well-studied for cognitive decline, ADHD, and age-related memory loss.
Vaccinium myrtillus L.
Recognised by the German Commission E and reviewed in the EU herbal monograph, bilberry's anthocyanoside-rich fruit extract has been studied since the 1960s for vasoprotective, antioxidant, and retinal-protective activity.
Sambucus nigra L.
Clinically proven to shorten the duration and severity of colds and influenza. Anthocyanin-rich extracts show significant results in meta-analysed RCT data. German Commission E–approved for upper respiratory infections.
Piper nigrum L.
The world's most traded spice, black pepper's piperine dramatically alters the absorption of certain drugs and nutrients, while activating pain receptors and showing anticonvulsant activity in preclinical research.
Peumus boldus Mol.
A Chilean tree traditionally used as a digestive and hepatobiliary remedy, boldo's principal alkaloid boldine exerts hepatoprotective, antispasmodic, and antioxidant activity.
Ruscus aculeatus L.
Europe's most clinically studied venotonic plant, butcher's broom's ruscogenin saponins contract vein walls to relieve heavy legs, varicose veins, and hemorrhoids, with additional evidence for orthostatic hypotension.
Eschscholzia californica Cham.
A gentle, non-addictive sedative recognised in the EU and French Pharmacopoeia, California poppy's pavine alkaloids act through GABA-ergic, serotonergic, and analgesic pathways to support sleep.
Capsicum annuum L.
The source of capsaicin — a potent TRPV1 agonist with an FDA-approved pharmaceutical application (Qutenza 8% patch) for neuropathic pain. Multiple clinical trials confirm efficacy for postherpetic neuralgia, diabetic neuropathy, and osteoarthritis. Also studied as a thermogenic agent for weight management.
Vaccinium macrocarpon Aiton
The basis of the first-ever European health claim granted to a plant ingredient, cranberry's A-type proanthocyanidins are studied for anti-adhesion activity against uropathogenic bacteria, supporting urinary tract health.
Taraxacum officinale Weber ex F.H.Wigg.
A clinically documented diuretic and hepatoprotective herb used extensively in European phytomedicine. Human trials confirm significant diuretic activity via potassium-sparing inulin mechanisms. Sesquiterpene lactones (taraxacin) stimulate bile flow, supporting liver function and cholesterol metabolism.
Desmodium adscendens (Sw.) DC.
A West African vine traditionally used for viral hepatitis and asthma, desmodium's principal saponin dehydrosoyasaponin I exerts hepatoprotective, anti-asthmatic, and analgesic activity.
Harpagophytum procumbens DC.
Africa's most-studied anti-inflammatory plant, devil's claw's harpagoside-rich tuberous root is recognised by the EMA and German Commission E for musculoskeletal pain, with validated analgesic activity across multiple RCTs.
Echinacea purpurea (L.) Moench
North America's most widely used immunostimulant herb, backed by Cochrane-reviewed evidence for reducing cold duration and severity. Alkylamides activate CB2 cannabinoid receptors and toll-like receptors, producing multivalent antiviral and anti-inflammatory effects confirmed across 59 primary references.
Trigonella foenum-graecum L.
An ancient leguminous herb with documented antidiabetic, hypolipidaemic, and galactagogue activity. Galactomannan fibre slows glucose absorption while steroidal saponins modulate insulin sensitivity. Also studied for testosterone support and lactation enhancement.
Fumaria officinalis L.
A traditional cholagogue and hepatobiliary remedy, fumitory's principal alkaloid protopine exerts amphocholeretic, antispasmodic, GABA-ergic, and antihistaminic activity.
Allium sativum L.
Likely humanity's oldest cultivated medicinal plant, garlic's organosulfur compounds — allicin, ajoenes, and their degradation products — are studied for cardiovascular, antimicrobial, and anticancer effects.
Matricaria chamomilla L.
One of the most widely used medicinal plants in the world. Apigenin binds GABA-A receptors to produce anxiolytic and sedative effects, while chamazulene and bisabolol deliver potent anti-inflammatory and gastroprotective activity confirmed across multiple clinical trials.
Zingiber officinale Roscoe
A clinically validated antiemetic and anti-inflammatory agent backed by 101 primary references. Gingerols and shogaols inhibit COX-2 and 5-LOX simultaneously. Multiple RCTs confirm efficacy for pregnancy nausea, chemotherapy-induced vomiting, and osteoarthritis pain.
Ginkgo biloba L.
The world's oldest living tree species and one of the most extensively researched botanical medicines. Standardised EGb 761 extract is EMA-approved for cognitive decline and dementia. Ginkgolides act as selective PAF antagonists, improving cerebral circulation and demonstrating efficacy in multiple Alzheimer's RCTs versus donepezil.
Panax ginseng C.A. Meyer
Used for over 5,000 years, Asia's most studied medicinal root contains ginsenosides that modulate dopamine, GABA, nitric oxide synthase, and steroid receptor pathways simultaneously — recognised by WHO and German Commission E for adaptogenic use.
Centella asiatica (L.) Urban
Known as Mandookparni in Ayurveda, gotu kola's triterpenoid saponins form the basis of Madecassol, a pharmaceutical wound-care specialty, alongside documented venous, cognitive, and neuroprotective effects.
Camellia sinensis (L.) O. Kuntze
The unfermented tea leaf richest in catechins, above all EGCG (epigallocatechin gallate) — the compound behind most standardised green tea extract supplements, studied for antioxidant activity.
Paullinia cupana Kunth
A Brazilian seed with the highest natural caffeine concentration of any plant (up to 7% by dry weight), combined with theobromine, theophylline, and condensed procyanidin tannins that modulate caffeine release. Clinical studies confirm improvements in cognitive performance, fatigue reduction, and mood — with a smoother stimulant profile than coffee.
Gymnema sylvestre (Retz.) R.Br. ex Sm.
Known in Hindi as Gurmar, “the sugar destroyer,” this Ayurvedic vine is studied for antidiabetic effects and its distinctive ability to temporarily block perception of sweetness on the tongue.
Crataegus monogyna Jacq. / C. laevigata DC.
Called “the valerian of the heart,” hawthorn's proanthocyanidins and flavonoids increase cardiac contractile force, dilate coronary arteries, inhibit ACE, and produce anxiolytic effects via benzodiazepine receptor binding.
Hibiscus sabdariffa L. var. ruber
Known as Karkadé in Egypt and Bissap in West Africa, hibiscus calyces have been studied head-to-head against captopril and lisinopril for blood pressure, alongside antidyslipidemic and diuretic effects.
Ocimum tenuiflorum L. (= O. sanctum)
Known across Asia as Tulsi, holy basil is an adaptogenic herb with human-trial evidence for stress, anxiety, and blood sugar support.
Epimedium grandiflorum C. Morren
Known in Chinese medicine as Yin Yang Huo, horny goat weed's principal compound icariin is a documented inhibitor of the same enzyme (PDE5) targeted by prescription erectile dysfunction medications, carrying a comparable interaction risk.
Melissa officinalis L.
A well-documented natural remedy for anxiety and sleep problems. Rosmarinic acid raises calming GABA levels in the brain. EMA-approved for mild anxiety and sleep disturbance — one of the few herbs with direct regulatory approval.
Tilia cordata Mill. / T. platyphyllos / T. tomentosa
Europe's most beloved sleep and anxiety herb, linden flowers act on GABA and benzodiazepine receptors via tiliroside and farnesol, while its sapwood offers choleretic and antispasmodic activity.
Hericium erinaceus (Bull.) Persoon
A distinctive, spine-covered tooth fungus long used in Traditional Chinese Medicine, lion's mane is studied for erinacine and hericenone compounds that stimulate nerve growth factor (NGF) synthesis, with documented neuroprotective and anti-inflammatory activity specific to neuronal tissue.
Lepidium meyenii Walp.
Grown at extreme altitude in the Peruvian Andes, maca root is traditionally used for energy and fertility, and studied as an adaptogen with effects on libido and sexual function.
Filipendula ulmaria (L.) Maxim.
The salicylate-bearing meadow herb that gave aspirin its name, meadowsweet's phenolic heterosides and flavonoids support traditional use for rheumatism, gout, and fever, with anti-inflammatory pharmacology extending beyond its EMA traditional-use status.
Silybum marianum (L.) Gaertn.
The most extensively researched natural liver support supplement. Silymarin demonstrates antifibrotic and hepatoprotective activity across NAFLD, alcoholic liver disease, and viral hepatitis in multiple human clinical trials.
Leonurus cardiaca L.
Motherwort's leonurine and stachydrine compounds show cardiotonic, antihypertensive, anti-arrhythmic, sedative, neuroprotective, nephroprotective, and uterotonic pharmacology in aerial part preparations.
Nigella sativa L.
Black seed — among the most versatile medicinal plants in clinical research. A 2024 meta-analysis of 82 RCTs in 5,026 participants confirms benefits for inflammation, blood sugar, blood pressure, and immune function simultaneously.
Passiflora incarnata L.
Passionflower's flavonoids act on GABA-A receptors and central benzodiazepine binding sites, producing anxiolysis comparable to oxazepam in a clinical trial, with additional evidence for easing withdrawal from several substances.
Perilla frutescens (L.) Britton
Central to East Asian cuisine, perilla's leaf polyphenols are studied for antiallergic and anti-inflammatory effects, while its seed oil is exceptionally rich in omega-3 alpha-linolenic acid.
Polypodium leucotomos L.
Marketed as PLE or Fernblock, this tropical fern has been studied in over a dozen human clinical trials as an oral, systemic complement to sunscreen — reducing sunburn, UV-induced damage, and photo-triggered skin conditions via antioxidant phenolic acids.
Plantago spp.
One of the world's most widely used soluble dietary fibers, psyllium's mucilage-rich seed husk is studied for bulk-forming laxative, cholesterol-lowering, and glycemic-control effects, with an FDA-recognised heart health claim.
Prunus africana (Hook.f.) Kalkm.
Native to high-altitude African and Madagascan forests, pygeum's lipidosterolic bark extract is used for benign prostatic hyperplasia, with anti-inflammatory, antiproliferative, and growth-factor-inhibiting actions. The species is CITES Appendix II listed due to overharvesting.
Ganoderma lucidum (Fr.) P. Krast.
Known as Lingzhi in China, reishi is one of the most important fungi in Traditional Chinese Medicine, studied for triterpene and polysaccharide compounds with immunomodulant, hepatoprotective, and anticancer research — alongside a serious, well-documented drug-interaction profile including anticoagulants and immunosuppressants.
Rhodiola rosea L.
EMA-approved adaptogen for stress-related fatigue and burnout. Multiple double-blind RCTs in physicians, students, and athletes confirm consistent anti-fatigue and stress-resilience effects. Salidroside and rosavins are the clinically standardised active markers.
Salvia rosmarinus Schleid.
One of the most pharmacologically characterised culinary herbs. Rosmarinic acid and carnosic acid deliver potent antioxidant and neuroprotective activity. Emerging clinical evidence supports cognitive function and liver health benefits.
Tribulus terrestris L.
A widely marketed bodybuilding supplement, tribulus's best-documented effect works through a nitric-oxide pathway on libido and erectile function — not through raising testosterone, despite common marketing claims.
Curcuma longa L.
The most-cited medicinal plant in the pharmacological literature. Curcumin simultaneously targets NF-κB, COX-2, and phospholipase A2 — making it one of the broadest-spectrum natural anti-inflammatory agents available. Bioavailability is significantly improved with piperine or lipid-based formulations.
Serenoa repens (W.B. Bartram) Small
The most widely used and extensively studied herbal supplement for benign prostatic hyperplasia, saw palmetto's berry extract has an evidence base that has shifted substantially as larger, more rigorous trials have accumulated.
Schisandra chinensis (Turcz.) Baill.
Known in Chinese as Wu Wei Zi, the “five-flavor berry,” schisandra is valued as an adaptogen comparable to ginseng, with hepatoprotective and neuroprotective effects and a documented drug interaction worth knowing about.
Eleutherococcus senticosus Maxim.
Known as the “Taiga Root,” Siberian ginseng's eleutherosides inhibit the enzyme that degrades stress hormones and modulate adrenal and immune function through mechanisms distinct from Panax ginseng.
Arthrospira platensis (Nordst.) Gomont
A blue-green microalga and one of the most nutritionally dense natural substances studied in clinical medicine. C-phycocyanin and the high-molecular-weight polysaccharide Immolina drive immunostimulant and anti-inflammatory effects. Multiple RCTs confirm benefits for allergic rhinitis, lipid profiles, blood pressure, and malnutrition support.
Hypericum perforatum L.
Among the most rigorously studied herbal antidepressants, St. John's Wort shows genuine clinical efficacy for mild-to-moderate depression, matched by an equally genuine and clinically serious list of drug interactions.
Valeriana officinalis L.
The pre-eminent botanical sedative of Western medicine, used for over 2,000 years. Valerenic acid inhibits GABA-transaminase and acts as a direct GABA-A receptor ligand, producing documented improvements in sleep onset latency and quality across 51 primary references. EMA-approved for mild anxiety and temporary sleep disturbance.
Pausinystalia yohimbe (K. Schum.) Pierre
A West-Central African tree whose bark yields yohimbine, a selective alpha-2 adrenergic antagonist studied for erectile dysfunction, with well-documented cardiovascular and psychiatric risk that make it one of the more dangerous botanicals in common commercial use.
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Editorial Standards
Every guide follows a consistent three-step editorial process before publication.
Every guide cites PubMed-indexed RCTs, meta-analyses, and pharmacokinetic studies. Secondary sources are used only for historical context. No health claim is included without primary trial support.
Safety and dosage data are cross-referenced against the European Pharmacopoeia, EMA HMPC monographs, WHO Monographs on Selected Medicinal Plants, and the German Commission E — the gold standard bodies for herbal medicine regulation worldwide.
Study limitations are always noted. Animal data is never presented as clinical evidence. Single-study findings are flagged as preliminary. "Suggests" and "may" replace "proven" and "cures" — because accuracy matters more than authority.
Common questions about medicinal plants, herbal supplements, and how to use this reference.