NutriStack
Apixaban and Garlic Extract, a caution.
Concentrated garlic extracts inhibit platelet aggregation via allicin and related organosulfur compounds and have been linked to surgical bleeding. Adding garlic supplements to apixaban stacks antiplatelet activity on top of factor Xa inhibition, raising bleeding risk. Culinary garlic is not a concern.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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At a glance
- Substances
- Apixaban and Garlic Extract
- Pair type
- Caution
- Evidence (highest tier)
- Emerging
- Source citations
- 2 sources
- Stack Score effect
- −5 to your Stack Score (per scored caution row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Caution · Emerging evidence
Caution
What is happening. Concentrated garlic extracts inhibit platelet aggregation via allicin and related organosulfur compounds and have been linked to surgical bleeding. Adding garlic supplements to apixaban stacks antiplatelet activity on top of factor Xa inhibition, raising bleeding risk. Culinary garlic is not a concern.
Mechanism. Allicin and other thiosulfinates from garlic inhibit arachidonic acid metabolism, modify platelet membrane properties, and interfere with calcium signalling in platelets. This pharmacodynamic antiplatelet activity is additive to apixaban's factor Xa inhibition.
Recommendation. Avoid concentrated garlic supplements (aged garlic extract, allicin capsules) while on apixaban, and stop them at least 7 days before any planned surgery. Garlic used in cooking is fine.
Sources (2)
- Rahman K, Lowe GM. Garlic and cardiovascular disease: a critical review. J Nutr. 2006;136(3 Suppl):736S-740S. (Garlic platelet inhibition mechanisms.) PMID 16484553
- Heck AM, DeWitt BA, Lukes AL. Potential interactions between alternative therapies and warfarin. Am J Health Syst Pharm. 2000;57(13):1221-7. (Garlic antiplatelet activity in anticoagulant context.) PMID 10902065
Stack Score
How this pair moves the number.
Effect on the composite score
If both Apixaban and Garlic Extract are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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