Complete Collagen features 10g of non-GMO collagen per scoop, sourced from pasture-raised, grass fed cattle. This means you can be sure your collagen is free from both antibiotics and added hormones. Progressive has added Vitamin C so you can make the collagen you need. Your body can’t use a collagen supplement without Vitamin C, so they’ve added 100% of the RDA to ensure you get the full benefit. They have also 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. This superior blend is enzymatically hydrolyzed for easy mixing and better absorption. Supplementing collagen supports the connective tissue and collagen formation in your body, it helps to maintain strong bones, cartilage, teeth and gums, and it is nourishing for healthy hair, skin and nails.