What is Doctor\'s Best Collagen Types 1&3? Doctor\'s Best Collagen Types 1 and 3 contains hydrolyzed collagen protein (BSE-Free), which contributes to the growth and maintenance of healthy tissues. Collagen is the structural protein essential for the strength and flexibility of bones, joints, tendons, ligaments, hair, skin, nails, and other tissues throughout the body. Vitamin C is added to the formula as an important nutrient required for collagen synthesis by the body. How does it work? Type I collagen is the most abundant protein in the human body and the major protein found in skin providing it\'s tensile strength and resiliency. Type 3 collagen is found at high levels in cardiovascular tissue and also in newly developing skin. Types 1&3 collagen are often found together in the same tissues because each form complements the structural integrity of the other. Collagen synthesis is a continuous process throughout life. Collagen is essential for growth and repair. Rejuvenation and renewal of every tissue throughout the body requires the production of newly synthesized collagen. However, this process can become less efficient as we age leading to decreased renewal of old tissue. This is manifested internally as a lessened efficiency of organ and tissue function. As the skin ages, the levels of Types 1&3 collagen, as well as elastin, decrease in the dermis resulting in the loss of elasticity. Why should I take Doctor\'s Best Collagen Types 1&3? Collagen synthesis is a continuous process that includes production of newly synthesized collagen. However, this process can become less efficient as we age leading to decreased renewal of old tissue. This effect of aging results in the appearance of wrinkles, fine lines, skin blemishes and discoloration and an aged look. Doctor\'s Best Collagen Types 1&3 provides amino acids that are building blocks for the growth, maintenance and integrity of collagen-rich tissues. This supports rejuvenation of the body\'s healthy structure as it ages.Non GMO, Gluten free, Soy free.