NutriStack
Aspirin Low-Dose and Flaxseed Oil, a caution.
Flaxseed oil supplies alpha-linolenic acid and may have mild antiplatelet or lipid-mediated vascular effects, but direct clinical bleeding evidence is limited. Low-dose aspirin already inhibits platelets, so very high-dose flaxseed oil deserves caution in people with bleeding history or upcoming procedures. Food-level flax intake is less concerning than concentrated oil supplementation.
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
- Aspirin Low-Dose and Flaxseed Oil
- 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. Flaxseed oil supplies alpha-linolenic acid and may have mild antiplatelet or lipid-mediated vascular effects, but direct clinical bleeding evidence is limited. Low-dose aspirin already inhibits platelets, so very high-dose flaxseed oil deserves caution in people with bleeding history or upcoming procedures. Food-level flax intake is less concerning than concentrated oil supplementation.
Mechanism. Alpha-linolenic acid from flaxseed oil can alter fatty-acid composition and eicosanoid balance, with possible effects on platelet function. Aspirin irreversibly inhibits platelet COX-1, so any added platelet effect could be additive in susceptible users.
Recommendation. Use caution with high-dose flaxseed oil while taking low-dose aspirin. Tell your clinician before procedures and watch for unusual bruising, nosebleeds, black stools, or vomiting blood.
Sources (2)
- Prasad K. Flaxseed and cardiovascular health. J Cardiovasc Pharmacol. 2009;54(5):369-377. PMID 19568181
- Kaufman DW, Kelly JP, Wiholm BE, Laszlo A, Sheehan JE, Koff RS, et al. The risk of acute major upper gastrointestinal bleeding among users of aspirin and ibuprofen at various levels of alcohol consumption. Am J Gastroenterol. 1999;94(11):3189-3196. PMID 10566713
Stack Score
How this pair moves the number.
Effect on the composite score
If both Aspirin Low-Dose and Flaxseed Oil 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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