Bulb Powder
Powder of fresh or dried bulb, above all aged garlic, the most widely studied form.
Powder
French Pharmacopoeia List A (Bulb)
Biological Overview
Allium sativum is a perennial plant native to Central Asia, naturalized in southern Europe and cultivated throughout temperate regions. It persists via a bulb formed of cloves, growing up to 50 cm tall, with elongated flat leaves and white or pinkish flowers in umbels — sterile in temperate regions — enclosed before flowering in a membranous spathe with a very long point.
FamilyAmaryllidaceae
FructosansUp to 75% dry wt.
Key CompoundAllicin
OriginCentral Asia
Botanical Classification
Taxonomy & Identification
- Latin Name
- Allium sativum L.
- Family
- Amaryllidaceae (formerly Liliaceae/Alliaceae)
- Common Names
- Garlic, Ail
- Parts Used
- Bulb (fresh or dried), essential oil
- Origin
- Central Asia, naturalized southern Europe
- Habit
- Perennial bulb, up to 50 cm
Ethnobotany & Traditional Use
History & Tradition
Garlic is likely the oldest cultivated medicinal plant. It was once used in the prevention of plague and cholera, and Galen named it "the peasant's theriac."
In China, in a region specialized in garlic cultivation and where it is widely consumed, the number of centenarians is reported to be higher. The Egyptians elevated garlic to divine status; the pharaoh Cheops reportedly distributed a daily ration to the workers building the Great Pyramid, to give them strength and protect them from epidemics.
The Key Molecules
Allicin & Ajoenes — Deep Dive
Allicin forms only when garlic tissue is damaged, then rapidly degrades into the organosulfur compounds behind nearly every documented effect.
🧬
Enzymatic Formation
An intact clove has little odor, but when cut or crushed, alliin is converted into allicin by the enzyme alliinase, present in garlic's cellular vacuoles.
💨
Rapid Degradation Cascade
Odorous, highly unstable allicin gives rise to a whole series of compounds: diallyl sulfide, diallyl disulfide, diallyl trisulfide, ajoene, and dithiins.
🧊
Aged Garlic Pathway
In garlic aged and stored cold, a different, stable molecule forms: S-allylmercaptocysteine (= S-allylmercapto-L-cysteine), derived from gamma-glutamyl-cysteine (0.9% of clove weight).
⚖️
Preparation-Dependent Variability
All these compounds vary enormously with temperature and storage conditions, meaning the galenic form used strongly determines biological activity.
⚠ Standardization Matters
Not all garlic preparations work the same way
Garlic extract itself is hypocholesterolemic and raises HDL in multiple studies, while standardized dried garlic powder tablets (1.3% allicin, 300 mg three times daily) were not found effective in controlled trials — a clear demonstration that preparation form changes outcomes. [12][13]
Pharmaceutical Preparations
Parts Used & Available Forms
The bulb (fresh or dried) and the essential oil are the parts used, across a range of traditional and standardized forms.
Nebulisate & Mother Tincture
Nebulisate and mother tincture of the bulb, used in traditional phytotherapeutic practice.
Nebulisate · Tincture
Essential Oil
Essential oil, rich in diallyl di- and trisulfide, used for its own distinct indication set.
Essential Oil
Clinical Dosimetry
Dosages
The primary source gives one usual dose; clinical trial doses varied by preparation and outcome.
Phytochemistry
Composition
Documented phytochemistry of the bulb, the sole part with a described composition in the primary source.
Sugars & PolysaccharidesFructosans (up to 75% dry weight), inulin, proteins, lipids
≤75%
Organosulfur CompoundsAlliin, converted on damage to allicin, which degrades to diallyl sulfide (DAS), diallyl disulfide (DADS) and diallyl trisulfide (DATS)
Key Compound
S-AllylmercaptocysteineStable molecule present in aged garlic
Present
Phenolic Compounds & FlavonoidsDocumented phenolic and flavonoid fraction
Present
Trace ElementsRich in germanium and selenium
Present
Essential Oil Sulfur CompoundsDiallyl sulfide, diallyl disulfide (~60%), diallyl trisulfide (~20%)
EO Fraction
🫀
Antihypertensive
Reduces systolic and diastolic blood pressure via peripheral vasodilation, diuresis and ACE inhibition, with efficacy compared to atenolol in one trial. [2][3][4][5]
❤️
Hypocholesterolemic & Antiatherogenic
Reduces hepatic cholesterol biosynthesis, raises HDL, and acts on lipoproteins, LDL and macrophages against atherosclerosis; aged extract inhibits coronary calcification progression in statin patients. [6][15][16]
🩸
Antiplatelet & Fibrinolytic
Ajoenes inhibit platelet aggregation via lipoxygenase inhibition and interfere with fibrinogen receptor expression and thromboxane A2 formation. [18]
🛡️
Hepatoprotective
Fresh garlic extract inhibits acetaminophen-induced hepatotoxicity. [19]
🩹
Antidiabetic
Allicin's hypoglycemic activity is considered comparable to tolbutamide, and garlic opposes protein glycation, relevant to diabetic complications. [20][21]
🧠
Neuroprotective
Documented protection against beta-amyloid neurotoxicity and relevance to Alzheimer's disease. [23][24]
🦴
Antiarthritic
Evidence of a protective effect in hip osteoarthritis, with a putative mechanism of action. [26]
🦠
Broad-Spectrum Antimicrobial
Demonstrated bactericidal and fungicidal properties, intestinal antiputrefactive and anthelmintic activity, and inhibits Campylobacter jejuni biofilm. [27][28][29]
🛡️
Immunomodulant
Increases macrophage and Natural Killer cell activity and T- and B-cell production, significantly reducing the number, duration and severity of upper respiratory tract infections. [30]
🎗️
Cancer Chemoprevention
Diallyl disulfide protects against skin, liver, digestive tract and cervical cancers in mice; antimutagenic via detoxification enzyme stimulation; organosulfur compounds modulate carcinogen-activating cytochromes and inhibit DNA adduct formation. [31][33][34]
🔥
Anti-Inflammatory & Immunomodulant
Documented anti-inflammatory and immunomodulatory effects from garlic organosulfur compounds. [42][43]
🧪
Nephroprotective
Documented protective effect against nephropathy as a natural antioxidant source. [22]
🦠
Antiviral (Essential Oil)
Molecular docking studies show garlic's organosulfur compounds, above all diallyl sulfide and triallyl sulfide, possess anti-coronavirus (SARS-CoV-2) activity. [45]
🦟
Mosquito Repellent (Essential Oil)
Diallyl trisulfide and diallyl tetrasulfide repel Aedes aegypti mosquitoes. [46]
Clinical Applications
Clinical Indications
Traditional and researched uses for the whole plant, plus a distinct indication set for the essential oil.
🫀
Cardiovascular
Primary Indication Set
- Hypertension: primary documented indication. [47]
- Hypercholesterolemia: documented indication.
- Intermittent claudication & cerebral sclerosis: documented traditional indications.
- Prevention of thrombosis & arteriosclerosis: documented indication.
🩸
Metabolic
Diabetes & Thyroid
- Diabetes: documented indication.
- Hyperthyroidism: documented in combination with fenugreek in animal research. [48]
🎗️
Cancer Prevention
Avoid Heating for This Use
💧
Essential Oil
Aromatherapy-Specific Indications
- Worm infestations (verminoses): documented indication.
- Hypertension; vascular risk & metabolic syndrome: documented indications.
- Gastritis & H. pylori ulcers: documented indication, but the oil is caustic.
Pharmacodynamics
Mode of Action
The documented mechanism behind garlic's organosulfur pharmacology.
🔪
Tissue Damage Triggers Activation
An intact clove has little odor. Cutting or crushing releases alliinase, which converts alliin into allicin — odorous, and highly unstable.
🧬
Allicin Degradation Cascade
Allicin gives rise to diallyl sulfide, diallyl disulfide, diallyl trisulfide, ajoene and dithiins — the compounds behind most documented pharmacological activity.
🧊
Cold-Aged Pathway
In garlic aged and stored cold, S-allylmercaptocysteine forms from gamma-glutamyl-cysteine (0.9% of clove weight) — a distinct, more stable pathway from fresh-clove alliinase activation.
⚖️
Preparation Determines Activity
All these compounds vary enormously with temperature and storage conditions, meaning galenic forms themselves are highly variable in their biological activity.
Clinical Safety
Safety, Interactions & Precautions
Documented contraindications, drug interactions and precautions for bulb and essential oil preparations.
Adverse Effects
- High-dose gastric intolerance: poor gastric tolerance documented at high doses.
- Odor: garlicky breath and perspiration odor.
- Hypothyroidism: caution advised with the essential oil.
- External use: the essential oil is dermocaustic in external application.
Drug Interactions
- Pharmacokinetic: no significant effect on CYP1A2, CYP2D6 or CYP3A4, but a significant decrease in CYP2E1 activity, affecting alcohol metabolism; classified as a CYP3A4 non-inhibitor; inhibits CYP2C9. [52][53][54]
- HIV medications: documented interactions with saquinavir and ritonavir. [55][56]
- Antidiabetic drugs: theoretical additive effect risk.
- Blood thinners & NSAIDs: interactions with aspirin, oral anticoagulants, warfarin and NSAIDs, with bleeding risk; stop garlic supplements at least 7 days before surgery. [57][58][59][60]
Clinical Disclaimer: This monograph is for educational and professional reference only. It does not constitute medical advice, diagnosis, or treatment guidance. Always consult a qualified healthcare provider before initiating any phytotherapeutic regimen, particularly if you are taking prescription medications, are scheduled for surgery, or have existing health conditions.
Common Questions
Frequently Asked Questions
What is garlic traditionally used for?
Garlic is likely the oldest cultivated medicinal plant. It was once used to prevent plague and cholera, and Galen called it the "peasant's theriac." Egyptians revered it as a divinity, and the pharaoh Cheops reportedly distributed a daily ration to the workers building the Great Pyramid to give them strength and protect them from epidemics.
Which part of the garlic plant is used medicinally?
The fresh or dried bulb is the primary part used, along with the essential oil.
What is allicin and why does it matter?
Allicin forms when the compound alliin is enzymatically converted by alliinase after garlic tissue is cut or crushed. Allicin is odorous and highly unstable, quickly degrading into diallyl sulfide, diallyl disulfide, diallyl trisulfide, ajoenes and dithiins — the compounds behind most of garlic's documented pharmacological activity.
Does garlic actually lower cholesterol?
A meta-analysis of 39 studies found that garlic used for more than two months reduced total cholesterol by about 17 mg/dL and LDL cholesterol by about 9 mg/dL in people with elevated cholesterol, with excellent tolerability. However, standardized garlic powder tablets (1.3% allicin, 300 mg three times daily) were not found effective in some controlled trials, showing that the preparation form matters.
Does garlic lower blood pressure?
Yes. A meta-analysis of 20 trials with 970 participants found garlic reduced systolic blood pressure by 5.1 mm Hg and diastolic blood pressure by 2.5 mm Hg compared to placebo, with efficacy on systolic and diastolic pressure reported as comparable to atenolol in one trial.
Can garlic interact with blood thinners or surgery?
Yes. Garlic has documented interactions with aspirin, oral anticoagulants, warfarin and NSAIDs, with an increased bleeding risk. It is recommended to stop garlic supplements at least 7 days before any surgical procedure.
Can garlic interact with HIV medications?
Yes, a documented interaction exists with the HIV protease inhibitors saquinavir and ritonavir.
Does heating garlic reduce its benefits?
For cancer-prevention effects specifically, the primary source notes that heating appears to inhibit these properties, and recommends avoiding heating garlic when this is the goal.
Primary Literature
Bibliography
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Lieben Louis X, Murphy R, Thandapilly SJ, Yu L, Netticadan T. Garlic extracts prevent oxidative stress, hypertrophy and apoptosis in cardiomyocytes: a role for nitric oxide and hydrogen sulfide. BMC Complement Altern Med. 2012;12:140. Full Text →