Grape skin powder concentrates the polyphenols found in grape peels, including resveratrol. The body uses these compounds for antioxidant defense. Many people take it to support heart function, maintain normal blood sugar, and promote healthier skin. Taking it alongside a meal helps the body absorb its fat soluble components.
Powder and capsule forms are both common. The dose differs between products, so follow the label for resveratrol or total polyphenol amounts.
Grape skin can thin the blood slightly. This supplement might also lower blood pressure or shift blood sugar values. If you use anticoagulants, blood pressure drugs, or diabetes medications, or if an operation is coming up, speak with a healthcare provider before adding it. Evidence on safety during pregnancy and nursing is thin.