What Is Collagen Type 1, 2, and 3? | Type-by-Type Guide

Collagen is the most abundant protein in your body, with at least 28 known types, but types 1, 2, and 3 account for the vast majority in your tissues. Each serves a distinct structural role, and understanding the difference helps you pick the right supplement for your goal—skin elasticity, joint comfort, or bone strength.

Collagen Types 1, 2, and 3: What Each Does in Your Body

Type 1 is the structural backbone of skin, bones, tendons, and ligaments. Type 2 is the primary collagen in cartilage. Type 3 supports blood vessels, muscles, and organs, and commonly appears alongside type 1 in connective tissues.

Type 1 collagen — Making up about 90 percent of your total collagen, per the Cleveland Clinic, it provides strength to skin, bones, tendons, ligaments, teeth, and corneas. Bovine and marine sources are rich in type 1, which is why most beauty-focused supplements contain primarily this type. Without adequate production, skin loses firmness and bones become more fragile.

Type 2 collagen — Concentrated in cartilage, particularly the elastic cartilage cushioning joints, it is key for joint support and arthritis management. Chicken and porcine sources typically provide the most type 2, so joint-focused supplements often list chicken sternum cartilage as the source.

Type 3 collagen — Found in muscles, arteries, blood vessels, and organs, it supports tissue elasticity and frequently co-occurs with type 1 in connective tissues (e.g., skin and blood vessel walls). Bovine sources yield both types 1 and 3.

Do You Need a Type-Specific Supplement?

For most people, a standard hydrolyzed collagen supplement with mixed types works as well as a type-specific product. Your digestive system breaks collagen into amino acids and peptides regardless of source, so the body distributes those building blocks where needed. Clinical evidence does not convincingly show type-specific products outperform mixed-type ones for skin health or joint comfort. Type labeling tells you more about the source than how the body will use it.

Hydrolyzed collagen is simply collagen broken into smaller peptides for easier absorption, allowing peptides to travel through your bloodstream to support connective tissues. Most supplements on the market are hydrolyzed, whether they list types 1, 2, or 3 on the label.

One notable exception is undenatured type 2 collagen, which works differently. It relies on intact type 2 protein structures and is not interchangeable with regular collagen peptides. Joint supplements using undenatured type 2 are a distinct category with a different mechanism, often labeled as UC‑II or similar branded forms.

Choosing the Right Collagen Type for Your Goals

For skin, hair, and bone support, choose a supplement rich in types 1 and 3. For joint and cartilage support, type 2 takes priority. Many supplements combine all three types for comprehensive support in one daily serving. To compare products including types 1, 2, and 3 in a single formula, see our picks for the best collagen with all three types. Pay attention to the source: bovine collagen naturally provides types 1 and 3, chicken or porcine sources offer more type 2, and marine collagen is almost exclusively type 1 (ideal for skin, less useful for joints). Reading the label tells you the types included and whether the collagen is hydrolyzed or undenatured. For most people, a high-quality hydrolyzed mixed-type supplement is the simplest and most effective choice.

FAQs

Can you take collagen types 1, 2, and 3 together?

Yes. Taking them together is safe and common. Most multi-type supplements combine all three, and the body processes each into amino acids that support skin, bones, joints, and blood vessels simultaneously.

Is type 1 or type 2 collagen better for skin?

Type 1 is better because it is the primary structural protein in skin tissue. Type 2 is concentrated in cartilage and does not directly support skin elasticity. Look for supplements labeled type 1 or types 1 and 3 for skin-focused use, and save type 2 for joint support.

What is the difference between hydrolyzed and undenatured collagen?

Hydrolyzed collagen is broken into smaller peptides for easier absorption and works broadly across the body. Undenatured collagen keeps its full protein structure intact, which matters specifically for type 2 joint supplements that rely on those intact structures for their targeted effect on cartilage.