Allicin
herbs
Allicin is a sulphur-containing compound derived from garlic (Allium sativum) that forms when garlic cloves are crushed or chopped. It is responsible for garlic's characteristic pungent odour and many of its purported health benefits. Allicin is unstable and degrades rapidly, making bioavailability and standardisation challenging in supplement form.
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Benefits
Dosage
Typical Dose
500-1000 mg daily of garlic extract standardised to allicin content
Upper Limit
Up to 2000-3000 mg daily in divided doses
Timing
With meals to enhance absorption and reduce gastrointestinal upset
Forms & Bioavailability
Garlic extract (standardised allicin)
Moderate (20-40%); stabilised with additional compounds
Aged garlic extract (Kyolic-type)
Low allicin content but higher S-allylcysteine; better stability
Fresh crushed garlic
High allicin yield but rapid degradation (minutes to hours)
Enteric-coated capsules
Improved stability; delayed release in intestines
Side Effects
Interactions
Research Summary
Allicin has been extensively studied for cardiovascular, antimicrobial, and antioxidant properties. Evidence supports modest benefits for blood pressure and cholesterol management, though results are mixed. Antimicrobial activity is well-documented in vitro but clinical efficacy remains inconsistent. Instability and rapid degradation significantly limit bioavailability in supplement form, reducing effectiveness compared to fresh garlic. High-quality randomised controlled trials are limited, and many studies use non-standardised garlic preparations, making conclusive recommendations difficult. The European Medicines Agency recognises garlic as a traditional herbal medicinal product.
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The Bottom Line on Allicin
Allicin is moderately researched with promising but sometimes mixed evidence.It is most commonly used for supports cardiovascular health and may help maintain healthy blood pressure and cholesterol levels and demonstrates antimicrobial and antibacterial properties against various pathogens. As with any supplement, individual results vary. Start with the lower end of the dosage range and assess for 4-8 weeks before adjusting.
About Our Research
This profile is compiled from peer-reviewed research published on PubMed, the NIH Office of Dietary Supplements, and established nutritional science databases. Dosages reflect clinically-studied amounts from human trials where available. We update profiles as new research emerges. This is not medical advice — consult a healthcare professional before supplementing.
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