Difference Between Collagen 1, 2, and 3 | Skin, Joints & More

Walking the supplement aisle, you’ve seen the numbers: type I, type II, type III. They are not interchangeable. Each collagen type serves a distinct role in the body, and picking the right one depends entirely on what you’re trying to support. Here is what the science says about the difference between collagen 1, 2, and 3.

What Each Collagen Type Does

The three types differ in where they appear in the body and what mechanical job they perform. The table below lays out the basics.

Type I is the body’s most abundant collagen, making up roughly 90% of total collagen. It forms dense, thick fibrils that give strength to skin, bones, tendons, and ligaments. When you picture collagen as the scaffolding that holds the body together, type I is what you are picturing.

Type II is specialized for cartilage. It is the primary collagen in articular cartilage — the cushioning surface between joints — where it creates a moisture-holding network that absorbs shock. This makes type II the collagen type most directly linked to joint cartilage structure.

Type III works alongside type I in skin and connective tissue, but its job is different. It forms a more elastic network. The Cleveland Clinic notes that type III provides elasticity while type I provides tensile strength — the two are partners, not substitutes.

Which Collagen Type Should You Take?

Supplements are formulated around these differences, so matching the type to your target area matters more than buying a “complete” blend.

For skin, hair, nails, and bone support, type I or a type I + III formula is the most relevant choice. Most beauty-oriented collagen supplements lead with these two types because they are the structural collagens in skin and connective tissue.

For joint and cartilage-focused use, type II is the one to look for. It targets the cartilage itself and is the type used in joint-support supplements.

If you are weighing specific products, our tested roundup of collagen 1 2 3 supplement options breaks down what is actually worth buying for each goal.

A Note on Supplement Claims

Here is the nuance that most marketing skips. When collagen is hydrolyzed into peptides for supplements, the resulting fragments can be chemically similar across types I, II, and III. A review in Nutrients notes that once collagen is broken down that far, “type-specific” claims may be overstated for general use — the body likely processes the peptides similarly regardless of source.

The clear exception is undenatured type II collagen. It works through a different immune-tolerance mechanism that requires the protein’s structure to remain intact. This is a distinct product category from standard hydrolyzed collagen and is specifically studied for joint response.

The practical takeaway: choose by target area, not by the number of types on the label. Type I for skin and bone, type II for joints, type III for elasticity support.

FAQs

Can I take types I, II, and III together?

Yes. Many supplements combine types I and III, and adding type II covers joint support. There is no known downside to taking all three, but matching the type to your specific goal is more efficient than assuming more types mean better results.

Is type II collagen better than type I for joints?

Yes. Type II is the primary collagen in cartilage and is the type most directly tied to joint structure. Type I serves skin, bones, and connective tissue — it is not designed for cartilage support.

Where do these collagen types come from?

Type I is commonly sourced from bovine hide or fish skin. Type II typically comes from chicken sternum. Type III is often sourced alongside type I from bovine tissue. Always check the label if you have dietary restrictions or allergies.