Vital Proteins Collagen Peptides are sourced from grass-fed, pasture-raised bovine hides to ensure a natural, high quality, and sustainable source of this ancient nutrient. Collagen is the most abundant protein in the body ensuring the health and vitality of your skin, hair, tendons, cartilage, bones, and joints. These natural peptides are highly bio-available, digestible and soluble in cold or hot liquids.