Ginkgo Biloba, Time-Release [Nervous, Circulatory]. Research suggests that the extract from the leaves of the oldest tree on earth supports the memory function. You know this supplement as Ginkgo biloba, one of the five top-selling herbs in the U.S. NSP Time-Release Ginkgo Biloba gives you the benefits of ginkgo extract all day long. While it is known as a powerful free radical scavenger, ginkgo also appears to support blood circulation to the brain, thereby optimizing the amount of oxygen supplied to brain cells. It may also help increase blood flow to the extremities. Each tablet contains 120 mg of concentrated Ginkgo biloba extract standardized to 24 percent ginkgo flavone glycosides and 6 percent terpene lactones. NSP’s unique 12-hour, time-release formula provides a constant supply of ginkgo throughout the day.