No interactions were found between resveratrol and vitamins. Herbal supplements may pose a risk to patients with polypharmacy, since they can also affect the metabolism of a drug or other supplements. Resveratrol, found in grape skins, is often taken as an antioxidant supplement. Some evidence suggests that it may slow the metabolism of certain common medications and cause side effects.
Ginkgo biloba, which is used to treat memory, may have an antiplatelet effect, increasing the risk of serious bleeding in patients who are already taking blood thinners such as warfarin or apixaban.
