Collagen is a protein found in connective tissues throughout the body. This fibrous protein gives structure to joint cartilage, tendons, skin, bones, and nearly every organ in the body, which makes collagen crucial for overall health and graceful ageing.
Unfortunately, collagen production begins to decrease by the time you reach your mid-twenties. This collagen decline may make it necessary to take a collagen supplement in order to support joint health, younger-looking skin, and more.
While there are nearly 20 types of collagen within the body, there are three main types of collagen – collagen I, II, and III – and each form of collagen plays a specific role. Discover the function of each collagen, and decide what kind of collagen supplement is best for you.
Found in skin, tendons, bones, and ligaments, collagen I is a triple–stranded helical molecule that is 300 nm long.  Collagen I is the most abundant collagen in the body and is generally the most common type of collagen added to supplements.
Who should take collagen I: Those who want to support skin’s elasticity.
Type II collagen is naturally found in cartilage and in the eyes, and it is the least abundant collagen type in the body. Its form is similar to type I but smaller in diameter.
Who should take collagen II: Individuals who would like to support overall joint health.
Collagen type III is often found along type 1 in the body. It is the second most abundant collagen found in the body and is nearly identical to collagen I. It’s naturally found in the skin, artery walls, intestines and uterus. Oftentimes, type III and type I are combined in supplements.
Who should take collagen III: Those who would like to support younger-looking skin can take collagen III in conjunction with collagen I.
1.Lodish H, B. A. (2000). Molecular Cell Biology 4th edition. New York: W.H. Freeman.