Hydrolyzed collagen is collagen that's been broken down into more easily dissolvable amino acids, often available as a collagen powder dietary supplement. There is evidence that collagen supplementation can support skin, nails, joint and muscle health.Hydrolyzed collagen (HC), also known as collagen peptide or collagen hydrolysate, is a type of collagen that can be easily absorbed into the bloodstream when it's used as a supplement