Blackcurrant contains vitamins B, P, and A, pectin, phosphoric acid, tannins, carotene, potassium salts, and iron. Blackcurrant seeds contain the rare gamma-linolenic acid that belongs to the omega 6 fatty acid family. 2.5 dl of blackcurrants contain as much vitamin C as a small orange. Research has shown that the amount of vitamins remains more or less the same even when the berries are processed and preserved.