My granddaughter has been diagnosed with anxiety depression and possible adhd (?) is it safe to try gingka biloba .......she is 14?

Herbal preparations are not well studied. Younger patients should avoid if possible. Discuss behavioral therapy with your physician.

Perplexing as to why you might want an adolescent to start Gingko Biloba, which has NO proven benefit whatsoever in any medical or psychological condition. Furthermore, it is expensive, and often the dose listed on the bottle is in reality far smaller. Save money and time, and consult with the pediatric expert involved.