Collagen peptides with vitamin c: collagen diminishes with age. youtheory collagen advanced with vitamin c helps replenish this vital protein to fight the effects of aging by revitalizing skin, hair, nails, tendons and ligaments. hydrolyzed collagen protein: collagen is the single most abundant protein in the human body. It’s literally the ‘glue’ that binds us together. our hydrolyzed formula is highly bioavailable which means it is easily and rapidly absorbed in the body. beauty begins within: feel your best at every stage of life. support your wellness journey with high-quality youtheory supplements for healthy sleep, weight, energy, skin and mood. revitalize, replenish and nourish: we believe that health and beauty start inside with the best wellness supplements and products. the right choice: dairy free, soy free, and contains no gluten ingredients. this product is third-party tested and manufactured in the usa.