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Garlic's pharmacology depends entirely on preparation: (1) Fresh garlic: crushing activates alliinase enzyme → converts alliin to allicin (thiosulfinate) → allicin rapidly decomposes to diallyl sulfides and ajoene → these produce H₂S in vascular tissue → H₂S opens KATP channels → smooth muscle relaxation → vasodilation → BP reduction. (2) Aged garlic (Kyolic): 20-month aging converts unstable allicin to stable S-allyl cysteine (SAC) and S-allylmercaptocysteine → SAC is a potent antioxidant, NF-κB inhibitor, and eNOS activator → NO-mediated vasodilation. (3) Garlic oil capsules: heat during steam distillation destroys allicin → primarily diallyl sulfides remain → reduced pharmacological activity. This is why preparation method determines efficacy.
Independently graded against 173,636 indexed supplements with 177 published clinical interactions, sourced from PubMed, FDA CAERS, openFDA, and NIH DSLD | Last updated:
Not medical advice. Based on published clinical research and systematic reviews.
Safety
Moderate interactions. Monitoring, timing separation, or dose adjustment may be required.
Warfarin and other anticoagulants
SourceClinical pharmacology
HIV protease inhibitors (saquinavir)
SourceClinical study (saquinavir levels reduced 51%)
Isoniazid (TB treatment)
SourceLimited evidence
Blood pressure medications
SourceClinical consensus
Stop 2 weeks before surgery
Bleeding risk from antiplatelet effect.
Educational information only. This is not medical advice. These statements have not been evaluated by the FDA. Talk to your prescriber before starting, stopping, or combining any supplement with prescription medication.