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