Supports heart and cardiovascular wellness** Promotes healthy circulation** Contributes to energy metabolism** Helps metabolize carbohydrates and protein** Laboratory Tested. Niacin is a B vitamin that performs many beneficial functions in the body, including promoting a healthy heart and circulatory system.** Niacin aids in maintaining proper metabolic functioning, supporting energy metabolism as well as carbohydrate and protein metabolism.** Niacin capsules also contribute to digestive and nervous system health, while helping to maintain healthy skin and hair.**