... Brownish PowderCAS No.: 84929-27-1Specification: Proanthocyanidins 50%-95%, Polyphenols 50-95%, Anthocyanidins5%-50%Function:The antioxidant capacity of Grape Seed Extract ... subjects found that OPCs, taken at a dose of 100 mg 3 times daily, significantly improved major symptoms, including heaviness, ... much as you might use vitamin E or vitamin C, 50 mg of OPCs daily are sufficient. A higher dosage of ...