Collagen bụ protein dị mkpa nke na-enye nhazi na nkwado n'akụkụ dị iche iche nke ahụ, gụnyere akpụkpọ ahụ, ọkpụkpụ, akwara, na ligaments.Ka anyị na-aka nká, mmepụta nke collagen na-ebelata, na-eduga na wrinkles, akpụkpọ ahụ na-ada mbà, na nkwonkwo nkwonkwo.