Which herbal supplement is commonly associated with increased bleeding risk when used with anticoagulants or antiplatelet therapy?

• A. Ginkgo biloba
• B. Echinacea
• C. Saw palmetto
• D. St. John's wort

Answer: (A)

Some herbs can affect how blood clots, so using them with blood thinners or antiplatelet meds can raise the chance of bleeding. Ginkgo biloba is known for its potential to impair platelet function, which can prolong bleeding time. This means that when someone is taking anticoagulants like warfarin or antiplatelet drugs like aspirin, adding ginkgo can further increase bleeding risk, especially with higher doses or longer use. That’s why it’s the herb most commonly linked to this interaction.

The other options don’t fit as clearly for bleeding risk with anticoagulants. Echinacea is mainly noted for immune system effects and potential interactions with some drugs, but not a well-established bleeding risk. St. John’s wort tends to alter drug levels by inducing liver enzymes, which can lower anticoagulant effectiveness rather than raise bleeding risk. Saw palmetto has not as consistently demonstrated a bleeding risk interaction in the same way as ginkgo.