As we known, ginkgo biloba usually is used to prevent alzheimer and coronary heart disease. It is one of the most popular healthcare products. There is more than 5 billions market over the world per year.
The effective components is flavonoids and terpene lactones. So the standard of ginkgo biloba extract set the flavonoids and ginkgolides concentration. The flavonoids concerntration should between 22% to 27%. And the terpene lactones concerntration should among 5% to 7%. The flavonoids mainly made up from hupi flavonoid, four hydroxyflavone and isorhamnetin. Bilobalides, lactone A, B and C were the main effective terpene lactones in ginkgo biloba extract.
Not only the effective components concerntration was set, but also the side effective components concerntration was provided. The ginkgolic acid concerntration should below 5ppm(5mg/kg). Because the ginkgolic acid will lead to vessel inflammation and allergic reactions, the concerntration of them should keep the very low levels.
When you choose the ginkgo biloba extract on the markets or other shops, you had better check the concerntration of flavonoids, terpene lactones and ginkgolic acid. The higher flavonoids and terpene lactones concerntration, the better. And the lower ginkgolic acid, the better.