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5 Supplements That Are Dangerous With Blood Thinners
Medically reviewed by [RPh/PharmD Name], [License #] | Last updated: April 6, 2026
If you take blood thinners like warfarin, Eliquis, or Xarelto, some “natural” supplements can increase bleeding risk. Blood thinners already slow clotting. Mix them with the wrong supplement and even a small cut can become serious.
Important: This is educational only. Do not stop or add supplements without talking to your doctor or pharmacist.
1. Ginkgo Biloba
Risk: Increases bleeding risk. Ginkgo affects platelets, the cells that help your blood clot. With warfarin, this can lead to bruising, nosebleeds, or internal bleeding.
What to do: Avoid if you’re on any anticoagulant. Tell your provider if you’ve taken it.
2. Garlic Supplements / High-Dose Garlic
Risk: Thins blood further. Culinary garlic in food is fine, but garlic pills or extracts in large amounts can amplify the effect of blood thinners.
What to do: Limit to food amounts. Check with your pharmacist before using garlic capsules.
3. Fish Oil / Omega-3 >1g/day
Risk: High doses can inhibit platelet aggregation. At 1g+ daily, the bleeding risk goes up when combined with warfarin or DOACs.
What to do: Stay under 1g/day total EPA+DHA unless your doctor approves it. Read labels carefully.
4. St. John’s Wort
Risk: Lowers warfarin levels. This herb speeds up how your liver breaks down warfarin, which can make your blood less thin and raise clot risk.
What to do: Avoid completely with warfarin. It also interacts with many other Rx drugs.
5. Vitamin K [in high-dose supplements]
Risk: Reverses warfarin. Vitamin K is needed for clotting. Warfarin works by blocking Vitamin K. Big changes from supplements or shots can make INR unstable.
What to do: Keep Vitamin K intake consistent. Do not take Vitamin K pills without medical guidance.
Key Safety Tips If You’re on Blood Thinners
- Bring all supplements to every appointment – including gummies and teas.
- Watch for bleeding signs: unusual bruising, blood in urine/stool, bleeding gums, prolonged bleeding.
- No “no prescription needed” sites: Only buy supplements from reputable sources.
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Disclaimer: This content is for educational purposes only and is not medical advice. Blood thinners are prescription medications. Always consult a licensed pharmacist or your prescribing doctor before changing any medication or supplement. If you think you’re having a medical emergency, call emergency services.
