Ginkgo is very valuable in relieving depression and social anxiety, especially in the elderly who suffer from decreased blood circulation to the brain. How does it treat depression and anxiety? Well since it's an antioxidant that increases blood flow, it'll improve mental and social functions like mood regulation. In a study published in Journal of American Medical Association, patients who had taken 120 mg of Gingko Biloba extract per day had improved mental and social functions compared to those given the placebo. Here's a frequently recommended brand.