Grape seeds are rich in powerful antioxidants and natural plant compounds called oligomeric proanthocyanidin complexes (OPCs), Grape seed extract may play a role in cancer prevention, bone strength, oral health, healthy blood pressure and more, Grape seed extract may even be useful as a preventative or therapeutic agent in Alzheimer’s disease. The antioxidants, including flavonoids, linoleic acid, and phenolic procyanidins, in grape seed extract help protect your blood vessels from damage