Vegan, Organic Viridian's 100% Organic Ginkgo tincture is made with fresh Ginkgo biloba leaves. Our leaves come from the ancient Ginkgo biloba tree at Kinnersley Castle in Hereford. Certified organic by the Soil Association - better for the planet, better for you. Directions: Take 15 - 30 drops, 2 -3 times daily in a little fruit juice or water. Children under 12, half adult amount.