abstract |
New extracts of Ginkgo biloba leaves, comprising (a) 20 to 30% by weight of flavone glycosides, (b) 2.5 to 4.5% by weight of ginkgolides A, B, C and J (in total ), (c) from 2.0 to 4.0% by weight of bilobalides, (d) less than 10 ppm of alkylphenol compounds, and (e) more than 10% by weight of oligomeric proanthocyanidins (OPC). |