Cardio Miracle utilizes a very high quality grape seed extract with a high concentration of active polyphenols and with antioxidant properties. Grape seed extract helps to support nitric oxide synthase in the endothelium, supporting healthy blood pressure. . Grape seed extract is a flavonoid that has a high affinity for collagen structures, including those of your arteries and heart. It is known to support the structural integrity of tissue, helping in some instances to minimize physical wear and tear in the body. Studies may suggest that it may also help strengthen vein health and skin structure.