How Important Is The 'Type' When It Comes To Collagen? Collagen is a protein and both type I and type II contain: proline, glycine and hydroxyproline, but it’s the structure of these amino acids which defines whether we’re dealing with type I or type II. However, collagen needs to be hydrolysed in order to be used in the body. Hydrolysed means that the peptides have been broken down into small enough components to be absorbed by the gut and used by the body. Once the collagen is broken down the type becomes less relevant. So instead of focussing on type, focus more on ensuring your collagen is hydrolysed. AD #AbsoluteCollagen