# Alicin **Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/alicin **Data Source:** Hermetica Superfoods Ingredient Encyclopedia **Updated:** 2026-03-28 **Evidence Score:** 2 / 10 **Category:** Compound **Also Known As:** Diallyl thiosulfinate, Allyl 2-propenethiosulfinate, Garlic factor, Allicine, 2-Propene-1-sulfinothioic acid S-2-propenyl ester ## Overview Allicin is a bioactive organosulfur compound produced when garlic is crushed, formed by the enzyme alliinase acting on alliin. It demonstrates potent [antimicrobial](/ingredients/condition/immune-support) activity by disrupting sulfhydryl groups in microbial proteins and enzymes. ## Health Benefits • [Antimicrobial](/ingredients/condition/immune-support) properties: Allicin exhibits broad-spectrum activity against bacteria, though specific human trials are lacking. • Antifungal effects: It has shown efficacy in inhibiting fungal growth in vitro. • Plant defense: Acts as an antifeedant, protecting plants from pests. • Inhibits lipid synthesis: Demonstrated in non-human studies, though clinical relevance is unclear. • Broad biological reactivity: Due to its thiosulfinate group, though specific human pathways are not detailed. ## Mechanism of Action Allicin exerts [antimicrobial](/ingredients/condition/immune-support) effects by reacting with sulfhydryl (-SH) groups in cysteine residues of microbial proteins and enzymes, disrupting cellular functions. It also interferes with thiol-containing enzymes essential for bacterial [metabolism](/ingredients/condition/weight-management) and can damage fungal cell membranes through [oxidative stress](/ingredients/condition/antioxidant) mechanisms. ## Clinical Summary Most allicin research consists of in vitro studies demonstrating [antimicrobial](/ingredients/condition/immune-support) activity against various bacteria and fungi. Limited human trials exist, with small studies (20-100 participants) showing potential benefits for upper respiratory infections using garlic extracts standardized to 180-900mg allicin potential daily. The compound's instability makes clinical research challenging, as allicin degrades rapidly unless stabilized in specialized formulations. ## Nutritional Profile Allicin (diallyl thiosulfinate) is a bioactive organosulfur compound, not a macronutrient or micronutrient itself, but a secondary metabolite formed enzymatically when garlic tissue is damaged. It is not a source of calories, protein, fat, or fiber. Molecular formula: C6H10OS2; molecular weight: 162.27 g/mol. Allicin is the primary thiosulfinate in freshly crushed garlic, typically yielding approximately 2.5–4.5 mg of allicin per gram of fresh garlic under optimal conditions, though actual yield depends heavily on crushing method, temperature, and pH. It is highly unstable and begins degrading within minutes to hours at room temperature, converting into secondary organosulfur compounds including diallyl disulfide (DADS), diallyl trisulfide (DATS), ajoene, and vinyldithiins. Bioavailability is a significant concern: allicin is rapidly metabolized in the gut and bloodstream, making systemic detection in its intact form difficult; most commercial garlic supplements deliver allicin precursors (alliin) rather than allicin itself. No significant vitamins, minerals, or macronutrients are attributed to allicin as an isolated compound. Its biological activity is primarily driven by its high reactivity with thiol-containing proteins and enzymes via cysteine modification. ## Dosage & Preparation No clinically studied dosage ranges or standardization details for allicin are provided in the research. Consult a healthcare provider before starting any new supplement. ## Safety & Drug Interactions Allicin can cause gastrointestinal irritation, heartburn, and garlic odor in breath and sweat. It may enhance anticoagulant effects of warfarin and increase bleeding risk when combined with antiplatelet medications. High doses may cause contact dermatitis and should be avoided before surgery due to bleeding concerns. Pregnant and nursing women should limit intake to culinary amounts due to insufficient safety data. ## Scientific Research The research dossier lacks specific human clinical trials, RCTs, or meta-analyses for allicin. No PMIDs are provided, and the focus is primarily on chemistry and general biological properties. ## Historical & Cultural Context The research does not provide information on traditional or historical use of allicin. It is primarily identified as a modern defense molecule in garlic. ## Synergistic Combinations Garlic extract, Ginger, Turmeric, Black pepper, Quercetin ## Frequently Asked Questions ### How much allicin is in fresh garlic? One fresh garlic clove contains approximately 5-18mg of allicin when crushed, with levels varying based on garlic variety and storage conditions. Crushing or chopping activates alliinase enzyme to convert alliin into active allicin. ### Does cooking destroy allicin in garlic? Yes, cooking temperatures above 60°C (140°F) rapidly destroy allicin and deactivate the alliinase enzyme needed for its formation. To preserve allicin, crush garlic and let it sit for 10 minutes before cooking, or add it raw to finished dishes. ### What is the difference between allicin and aged garlic extract? Allicin is the fresh, unstable compound formed when raw garlic is crushed, while aged garlic extract contains stable sulfur compounds like S-allylcysteine formed during aging. Aged garlic has different therapeutic properties and better tolerability than fresh allicin. ### Can allicin supplements cause side effects? Allicin supplements commonly cause garlic breath, body odor, heartburn, and stomach upset. Higher doses may cause nausea, diarrhea, and increased bleeding risk, especially when combined with blood-thinning medications. ### How long does allicin stay active in the body? Allicin is rapidly metabolized within 2-6 hours after consumption, breaking down into various sulfur compounds like diallyl disulfide. Its instability means benefits likely come from metabolites rather than allicin itself persisting in circulation. ### Is allicin effective against antibiotic-resistant bacteria? In vitro studies have demonstrated that allicin exhibits antimicrobial activity against some antibiotic-resistant strains, including MRSA, though human clinical trials remain limited. Most evidence comes from laboratory settings, and the clinical relevance of these findings for treating infections in humans has not been definitively established. Further research is needed before allicin can be recommended as a substitute for or complement to conventional antibiotics for resistant infections. ### Does allicin interact with blood thinners or antiplatelet medications? Allicin may have mild antiplatelet properties based on mechanistic studies, raising theoretical concerns about interactions with medications like warfarin or aspirin, though significant clinical interactions have not been well-documented in humans. Individuals taking blood thinners should consult their healthcare provider before consuming high-dose allicin supplements. The practical risk appears low at dietary garlic levels, but supplemental doses warrant medical oversight. ### Why is allicin stability a problem in supplements, and how do manufacturers address it? Allicin is highly unstable and begins degrading immediately after garlic cells are crushed, breaking down during storage, heat exposure, and digestion, which limits its bioavailability in supplements. Manufacturers attempt to address this through enteric coating, stabilization technology, and formulation with cofactors like alliinase enzyme to promote allicin formation in the digestive tract. However, the actual allicin content delivered to systemic circulation from commercial supplements often falls far short of laboratory claims. --- *Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com* *License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*