Standardized

Ginkgo Leaves contain flavonoids, terpene lactones (including ginkgolides and bilobalide) and other compounds. Ginkgo 2:1 is standardized to contain 9.6 mg/mL of ginkgo flavonglycosides (ginkgo flavone glycosides) to ensure optimal strength and quality. Ginkgo can:

• provide antioxidant activity

• support normal memory function

• promote mental clarity

• maintain healthy eyes

• support normal hearing function

• support the body as it ages

• help maintain proper energy

• support a healthy cardiovascular system

• support healthy blood function

• support healthy oxygen flow to the brain and peripheral areas of the body*

Suggested Use: Dilute 1 mL (approx. 50 drops) in water or juice 3 times per day, or as directed.

Complimentary Educational Tools

• Ginkgo Study

• MediHerb The Quality Choice for Practitioners Handout

Ginkgo Quality Issues

The ginkgo flavonglycosides (ginkgo flavone glycosides) of Ginkgo biloba, comprising quercetin, kaempferol and isorhamnetin are the phytochemicals most often referred to as indicators of quality and efficacy. However, these compounds are mainly marker compounds which are used to identify the extract. The therapeutically active ingredients are believed to include the ginkgolides and bilobalide, which cannot be tested by normal HPLC methods. They require more sophisticated methods of detection such as Refractive Index (RI), Evaporative Light Scattering Detectors (ELSD) or Mass Spectrometry (MS). MediHerb uses ELSD detection to accurately quantify the levels of these therapeutically important phytochemicals. The other important group of phytochemicals from Ginkgo are the ginkgolic acids (C13:0, C15:1 and C17:1 on the third figure). These compounds have been identified as contact allergens. The maximum level of ginkgolic acids in Ginkgo biloba extracts has been set by the European authorities at 5 ppm. Many poor quality extracts contain levels of ginkgolic acids which are many orders of magnitude higher than this recommended maximum.