Proflavanol® 90 The grape, specifically extract from the grape's seed, is super helpful when it comes to your health. That's because grape-seed extract contains bioflavonoids, a big word for a tiny nutrient attributed to influencing cellular cycles. Bioflavonoids also enhance the work of antioxidants, namely vitamins C and E. USANA's powerful bioflavonoid supplement also combines the highest quality grape-seed extract with vitamin C (as Poly C®) for additional antioxidant protection. So you're thinking, if grapes are so good for you, why not just drink grape juice or wine? It's simple: by taking Proflavanol, you get a concentrated dose of bioflavonoids without the sugar, calories, and alcohol. Proflavanol 90 makes it easy to benefit from grapes!