Resveratrol is a naturally powerful antioxidant compound can be found in the red grape skin, Japanese knotweed, peanuts, and  blueberries. Reveratrol may help support the heart, circulatory system, lowering cholesterol, and clots which can cause heart attacks and stroke. Resveratrol may help with insulin resistance, a condition in which the body becomes less sensitive to the effects of the blood sugar-lowering hormone, insulin. Insulin resistance is a precursor to diabetes.