Type I. is densely packed and used to provide structure to your skin, bones, tendons and ligaments. Type II. This type is found in elastic cartilage, which provides joint support. Type III. This type is found in muscles, arteries and organs. Type IV. This type is found in the layers of your skin.
The human body needs different types of collagen for different functions in different parts. Some collagen types, like Type I, is great for tensile strength. Others, like Type II, for stretching in multiple directions (ligaments, organs). When it comes to collagen supplements, most will be sourced from just beef and contain Type I & III. My Balance's Collagen peptides offers all 5 types (I, II, III, V, & X) because it’s sourced from beef, chicken, fish, and eggshell membrane. There is much anecdotal data showing that humans benefit from multiple types of collagen.
Collagen is actually not a single molecule, but a huge family of related molecules each with different structures and functions. The collagens in multi collagen (I, II, III, V, & X) represent a broad spectrum of the most common and well-understood members of the family.