There are many different types of collagen – 16, to be precise. However, the most common and well-researched types of collagen include Types I, II, and III (90%). Type I Collagen and Type III Collagen are the most prevalent within our bodies. Type I collagen is accountable for strong hair, skin, nails, and bones. Type III serves for bone integrity and for the blood circulation system vessel's strength. Type II Collagen is less prevalent within the human body. It is widely present in joints and cartilage. Intake of Type II collagen is mostly for promoting joints health found in animal origin collagen, does not apply to fish marine collagen.