| OPC (oligomeric proanthocyanidins) and VMA (vaccinium myrtillus anthocyanoside ) belong to a group of ingredients called phenols. These are very strong antioxidants. Bilberry contains a lot of VMA while grape seed extract contains lots of OPC. As they are not equivalent their potency cannot be compared directly.
For patients with cataract(白內障), high dose of grape seed extract, vitamin E and vitamin C are recommended. CoQ10 is added as required. This combination has been shown to relieve symptoms of cataract.
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