MoreCloseHypertension300 mg per dayas Grape Seed Extract[2 stars] According to one study, grape seed extract may lower blood pressure in people with mildly elevated blood pressure.Learn MoreCloseRetinopathy150 mg daily[2 stars] Proanthocyanidins, a group of flavonoids found in pine bark, grape seed, and other plant sources, may help slow the progression of diabetic retinopathy.Learn MoreCloseSunb