Ginkgo is generally well tolerated and safe when taken at the recommended dosages. However, in rare cases, side effects may occur, including mild stomach discomfort, headaches, dizziness, or allergic skin reactions. If you experience any of these symptoms, you should stop taking Ginkgo and consult a doctor. People who are taking blood-thinning medications should be especially cautious, as Ginkgo can affect blood clotting. Pregnant and breastfeeding women should also consult their doctor before using Ginkgo products.