Ginkgo (Ginkgo biloba) is one of the oldest living tree species. It is also one of the best-selling herbal supplements in the United States and Europe. Ginkgo has a long history of use in treating blood disorders and memory issues. It is best known today as way to potentially keep your memory sharp.

Large amounts of ginkgotoxin can cause seizures. Ginkgotoxin is found in ginkgo seeds and, to a lesser extent, ginkgo leaves. If you are older, have a bleeding disorder or are pregnant, don't take ginkgo. The supplement might increase your risk of bleeding.

Ginkgo biloba is generally safe and well-tolerated at doses up to 240 mg per day. Higher doses are more likely to cause side effects and drug interactions. However, lower doses can still cause side effects, such as stomach issues or headaches.

When taken by mouth: Ginkgo LEAF EXTRACT is likely safe for most people. It can cause some minor side effects such as stomach upset, headache, dizziness, and allergic skin reactions. There is also some concern that ginkgo leaf extract might increase the risk of bruising and bleeding or cause arrhythmia.