ModerateCaution
Fish oil has antiplatelet properties that add to aspirin's cyclooxygenase inhibition, potentially increasing bleeding risk. While the combination is sometimes used therapeutically for cardiovascular benefit, the additive antiplatelet effect requires awareness of increased bleeding potential.
Recommendation: Low-dose fish oil (1-2g/day) with low-dose aspirin is often considered acceptable for cardiovascular benefit, but monitor for increased bruising or bleeding. Higher fish oil doses (>3g/day) further increase bleeding risk. Discuss with your cardiologist.
SeriousCaution
Ginkgo biloba's potent antiplatelet activity (PAF antagonism) combined with aspirin's COX-1 inhibition creates significant additive bleeding risk. Serious bleeding events including intracerebral hemorrhage have been reported in patients taking both agents. The dual antiplatelet mechanism is particularly concerning.
Recommendation: Avoid ginkgo biloba while taking aspirin, even at low doses. The combination substantially increases bleeding risk through complementary antiplatelet mechanisms. Inform your prescriber if you use ginkgo supplements.
SeriousCaution
Concurrent anticoagulant and antiplatelet therapy significantly increases bleeding risk. While sometimes used intentionally (e.g., mechanical heart valves), the combination requires careful risk-benefit assessment and close monitoring.
Recommendation: Only use together when specifically prescribed by a physician for an approved indication. Monitor for signs of bleeding. Use lowest effective aspirin dose. Regular INR monitoring essential.
ModerateCaution
Garlic supplements inhibit platelet aggregation and have been compared head-to-head with aspirin and clopidogrel in clinical studies showing measurable antiplatelet effects. Combined with low-dose aspirin, garlic supplements stack antiplatelet activity and can increase bleeding risk, particularly perioperatively.
Recommendation: Avoid concentrated garlic supplements while on aspirin, and stop garlic supplements at least 7 days before any planned surgery. Cooking with garlic is fine.
DangerousCaution
Nattokinase is a fibrinolytic enzyme that directly degrades fibrin and reduces clotting factors. A documented case describes cerebellar hemorrhage in a patient with cerebral microbleeds who took aspirin plus nattokinase 400 mg/day for 7 days. The combination is particularly risky in patients with cerebral microangiopathy.
Recommendation: Avoid nattokinase while on aspirin, especially if you have a history of stroke, cerebral microbleeds, or uncontrolled hypertension. If you have been taking both, stop the nattokinase and call your prescriber.
ModerateCaution
Ginger extracts contain gingerols and shogaols that inhibit cyclooxygenase and thromboxane A2 synthesis, reducing platelet aggregation. Added to aspirin's irreversible COX-1 inhibition, ginger supplements stack antiplatelet activity and can raise bleeding risk, particularly perioperatively.
Recommendation: Avoid concentrated ginger extract on aspirin. Culinary amounts of ginger in food are fine. Stop ginger supplements at least 7 days before any planned surgery.
ModerateCaution
Lycopene has antiplatelet activity in platelet studies, and an in vitro human platelet study directly evaluated lycopene with aspirin and found additive inhibition of platelet aggregation under test conditions. Direct clinical bleeding outcome data are lacking, but the combination is plausible enough to matter in people already at bleeding risk.
Recommendation: Use lycopene supplements cautiously with low-dose aspirin, especially if you also take anticoagulants, clopidogrel, NSAIDs, SSRIs/SNRIs, or have a history of ulcers or bleeding. Keep doses stable and report easy bruising, nosebleeds, black stools, or prolonged bleeding. Do not stop prescribed aspirin without clinician guidance.
SeriousCaution
Alcohol increases the risk of upper gastrointestinal bleeding from low-dose aspirin. Aspirin impairs platelet function and weakens gastric mucosal defenses, while alcohol can directly irritate the stomach lining. The risk is higher with daily alcohol use, prior ulcer disease, older age, or any history of GI bleeding.
Recommendation: Avoid heavy alcohol use while taking low-dose aspirin. If you drink, keep intake modest and seek urgent care for black stools, vomiting blood, faintness, or unexplained weakness.
ModerateCaution
Turmeric/curcumin supplements may add antiplatelet effects to low-dose aspirin. Culinary turmeric is usually a minor exposure, but concentrated curcumin products can deliver much larger doses. The combination is most concerning with prior bleeding, upcoming procedures, high-dose curcumin, or additional blood-thinning medicines.
Recommendation: Avoid high-dose turmeric/curcumin supplements with low-dose aspirin unless your clinician agrees. Stop curcumin before procedures if your surgical team recommends it, and report unusual bruising, nosebleeds, or black stools.
ModerateCaution
Curcumin phytosome products may produce higher systemic curcumin exposure than standard turmeric powders and may add antiplatelet effects to low-dose aspirin. Aspirin's platelet inhibition is intentional, but added antiplatelet activity can become risky around procedures or in people with bleeding history. Culinary turmeric is not the same exposure as a phytosome supplement.
Recommendation: Avoid high-dose curcumin phytosome with low-dose aspirin if you have bleeding risk factors or an upcoming procedure. Ask your clinician whether to pause the supplement before surgery or dental work.
ModerateCaution
Krill oil provides omega-3 fatty acids that may have mild antiplatelet effects, which can add to low-dose aspirin in higher-risk situations. Usual omega-3 doses generally show low bleeding risk in trials, but high-dose products, procedures, or other blood thinners deserve caution. The concern is stronger when krill oil is used as a concentrated omega-3 supplement rather than a low-dose dietary product.
Recommendation: Use caution with high-dose krill oil while taking low-dose aspirin. Tell your clinician before surgery or dental work, and report unusual bruising, nosebleeds, black stools, or vomiting blood.
ModerateCaution
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.
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.
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