Youtheory dietary supplement collagen powder is a supplemental source of vitamin c and dietary protein in powder form. Use it to replenish collagen and fight the effects of aging on your skin. This gluten-free, soy-free and dairy-free product contains hydrolyzed collagen. Add one rounded scoop of the powder to water or other liquids. There are about 17 servings per 4. 7 oz bottle. See nutrition facts panel for allergens.