Activin (patented formula), which is a grape seed extract, which contains many bioactive components: flavonoids, unsaturated fatty acids, proanthocyanidins, and tocopherols (vitamin E). Due to the presence of proanthocyjanidin, it has antioxidant potential (by inhibiting the development of exercise-induced production of free oxygen radicals), anti-inflammatory. It is important in prevention measures of heart and circulatory system. In the sports supplementation it is one of dietary supplement, and it is a part of some vitamin supplements, it is also an active ingredient in fat burners.