Progressive Complete Collagen - Unflavoured - Collagen is the most abundant protein in the body and contains essential amino acids which help with connective tissue formation and maintain healthy bones, cartilage, teeth and gums. Collagen also helps in maintaining healthy hair, skin and nails. Complete Collagen has added Vitamin C so you can make the collagen you need and added Tryptophan to complete the amino acid profile. Collagen does NOT contain all the essential amino acids, unless you add tryptophan. Tryptophan is the missing link that completes collagen’s amino acid profile, helping to improve its protein quality. Progressive Complete Collagen is sourced from non-GMO hydrolyzed collagen from pasture-raised, grass-fed cows that are free from antibiotics and added hormones.