SynerPro Grapine® with Protectors [Vital Nutrition]. The latest antioxidant news is out—Grapine is in! Grapine is derived from the bark of a select pine tree and grape seed (NSP uses authentic Masquelier OPC grape seed extract). Studies have shown that the proanthocyanidins in Grapine are up to 50 times more powerful as antioxidants than vitamin E. Proanthocyanidins are similar to compounds in bilberry. Unlike other antioxidants, they cross the blood-brain barrier to neutralize free radicals in vital brain and nerve tissues. Each tablet provides 20 mg of proanthocyanidins, plus 50 mg of grape skin extract, 20 mg vitamin C and the SynerPro Concentrate base. Grape skin contains anthocyanins that have been linked to reduced risk of cardiovascular disease.