There are around 16 different types of collagen, and the most common are types I, II, III, and IV. Type I accounts for 90% of the body’s collagen. It’s made from densely packed fibers and gives structure to skin, tendons, bone, cartilage, teeth, and connective tissue.
Type II is found in cartilage and cushions the joints, while Type III supports the structure of muscles, organs, and arteries. Healthline notes that Type IV works on filtration and is found in the skin.