What does Ginkgo biloba extract d2 mean?

This is a chemical extracted from Ginkgo biloba. Ginkgo biloba extract D2 is a chemical substance extracted from ginkgo orchards, and its main component is flavonoids. Ginkgo biloba extract D2 is widely used in traditional Chinese medicine, which has many functions such as improving blood circulation, enhancing memory, antioxidation and anti-inflammation.