* Science-Based Nutrition * Dietary Supplement * Essential Structural Support for Hair, Skin, Nails, Tendons, Ligaments and Bones * Provides improved bioavailability due to the low molecular weight of component pepetides Collagen is the major structural protein in connective tissue and the most abundant protein in the human body. It is responsible for maintaining the strength and flexibility of bones, joints, skin, tendons, ligaments, hair, nails, blood vessels and eyes, among other tissues throughout the body. Doctor"s Best Collagen Types 1 & 3 contains pure collagen protein peptain, which contributes the growth and maintenance of healthy tissues. Vitamin C is added to the formula, as it is an essential nutrient required for collagen synthesis by the body.