CareFast® Collagen Peptides nutritional drink mix delivers essential structural support for hair, skin, nails, tendons, ligaments, and bones. Our collagen peptides are sourced from grass fed bovine. Proteins are essential to every bone, every tissue, and every structure in the human body. Proteins are built on amino acids, which together form small protein components called peptides. Peptides are important in cellular function regulation, while individual amino acids exert specialized actions on specific cells and tissues.