Ginkgo biloba is one of the top-selling herbs in the United States.You may want to avoid adding ginkgo biloba if
you are taking daily doses of vitamin E, aspirin, ibuprofen, or any blood-thinning medication and prior to surgery. Recent studies indicate that ginkgo biloba extracts may cause excessive bleeding when combined with other blood-thinning agents. The U.S. Department of Health and Human Services recommends consulting with your doctor before using any ginkgo products. To play it safe, also consult with your doctor before taking other complementary and alternative medicines; herbs or supplements.
Source: National Institutes of Health