According to the card, this is a food supplement with evening primrose seed oil: each of the 30 capsules contains 1000 mg of oil. The oil contains essential fatty acids, including gamma-linolenic acid, and is used as a source of this acid in the daily diet. The card gives no comparison with other omega-6 supplements.
General information (not a manufacturer's instruction): the supplement is not a substitute for a varied diet, and the daily amount is given on the packaging.