Supports: May support circulatory and nervous system health.* Size: 4 oz. liquid Suggested Usage: 10 to 30 drops 3 times per day or as directed by your healthcare professional. Contains: Ginkgo biloba (leaf), Purified Water, Ethanol (25%). Nash, K. M., & Shah, Z. A. (2015). Current Perspectives on the Beneficial Role of Ginkgo biloba in Neurological and Cerebrovascular Disorders. Integrative medicine insights, 10, 1–9. doi:10.4137/IMI.S25054 Brondino, N., De Silvestri, A., Re, S., Lanati, N., Thiemann, P., Verna, A., … Politi, P. (2013). A Systematic Review and Meta-Analysis of Ginkgo biloba in Neuropsychiatric Disorders: From Ancient Tradition to Modern-Day Medicine. Evidence-based complementary and alternative medicine : eCAM, 2013, 915691. doi:10.1155/2013/915691