Welactin is a high-potency natural salmon oil supplement for dogs. Welactin can be mixed with food, and is a rich source of Omega 3 fatty acids which have beneficial effects in the following areas: Heart Health: helps support normal heart rhythm. Kidney Health: helps support renal function. Brain/Vision: helps support the nervous system. Skin Health: helps support coat & combats dry skin. Immune System Health: helps supports immune function. n a palatability study, Dogs preferred their regular food with Welactin.