Fenchem has enhanced testing for Ginktone ginkgo biloba extract in an effort to guarantee high purity of the product. Through its test method, the company can determine the ratio of two flavonoid monomers, differentiating the product from any adulterates. Ginktone is ex­tracted from 3- to 5-year-old Chinese ginkgo leaves. The ginkgo acid in Ginktone is controlled under 1 ppm.

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