Science-Based Nutrition Dietary Supplement Essential Structural Support for Hair, Skin, Nails, Tendons Ligaments, and Bones Non-GMO - Gluten Free - Soy Free Doctor's Best Collagen Types 1 and 3 contain pure collagen protein Peptan, which contribute 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. Helps support healthy hair, skin, nails. Helps support the strength of bones and flexibility, joints, tendons, and ligaments. Provides improved bioavailability due to the low molecular weight of component peptides.