 type 3 is for muscles arteries and organs and type 5 for skin for eyes and hair and type 10 helps with remineralization of our bone and remodeling of cartilage after we have injury or surgery and as we age after menopause it becomes harder to absorb the nutrients that make our collagen so it's really important that you get this type of collagen we also put in vitamin c which you have to have for collagen and biotin which is b7 known for helping convert