What is Resveratrol? Resveratrol is a polyphenol, a plant compound found in red grapes, peanuts and Japanese knotweed (Polygonum cuspidatum), to name a few. Polyphenols have antioxidant properties that are incorporated into many age defying supplements. NutraBlast Resveratrol is one such supplement that that supports the immune system health. Preliminary studies show that resveratrol offers multiple health benefits. Resveratrol supports healthy blood sugar levels.