This Carophyll red is a natural pigment extracted from crustaceans. Carophyll red is the "secret" ingredient in some baits. It is known in some circles of the bait industry as one of the top attractors for carp. This product is extracted mainly from krill and has a distinct smell of krill. Recommended dosage: 4-6 ml per kg. Dosage can be increased for higher levels of attraction for hookbaits/popups.