Frontline Formulations | Multi-Sourced CollagenCollagen Type 1,2,3,4,& 5! Multi Source Collagen is carefully engineered and balanced for athletes, active individuals, and anyone looking for a premium collagen source in their diet. Unflavored makes it perfect to mix in with any other drink! Collagen is the most abundant protein in your body. It provides structure to your bones, connective tissues, muscles, hair, skin, nails, teeth, and organs. After the age of 25, the bodys production of collagen