What Are the Different Types of Collagen? | A Simple Breakdown

For the full breakdown, see our best Collagen With All 5 Types guide.

Collagen is the most abundant protein in your body, acting as the structural glue for skin, joints, bones, and organs. But it isn’t a single substance. Scientists have identified at least 28 distinct collagen types, and each one does a different job. Understanding what are the different types of collagen matters if you’re choosing a supplement, because the type you take should match the problem you’re trying to address.

The Five Main Collagen Types Anyone Should Know

While dozens of collagen types exist, five dominate human biology and the supplement aisle. These are the ones that matter in practice:

• It provides tensile strength in skin, bone, tendons, and ligaments. This is the type most common in beauty and skin-health supplements.
• Type II — The major collagen in cartilage. It’s the type you want for joint health, and it’s typically sourced from chicken sternum in supplements.
• Type III — Found alongside Type I in muscles, arteries, and organs. It’s often paired with Type I in marine and bovine supplements for skin and gut health.
• Type IV — A key component of basement membranes, the thin layers that separate tissues. It’s less common in supplements.
• Type V — Found in the cornea, skin, hair, and placenta. It often co-purifies with Type I.

Knowing this distinction matters because a joint supplement won’t help your skin much, and vice versa. Type I and III target skin and connective tissue; Type II is specifically for cartilage and joint cushioning.

How Collagen Types Are Classified

Beyond the five main types, researchers group all 28 types into broader families based on their structure. These classifications explain how each collagen builds tissue:

• Fibril-forming collagens — Types I, II, III, V, and others form long, rope-like fibers that give tissues tensile strength.
• Network-forming collagens — Types IV and VIII create sheet-like mesh structures in basement membranes.
• FACITs — Fibril-associated collagens with interrupted triple helices (Types IX, XII, XIV) link fibrils to other matrix components.
• Transmembrane collagens — Types XIII, XVII, and others span cell membranes, connecting cells to the matrix.
• Multiplexins, anchoring fibrils, and beaded filaments — Rare types with specialized roles in specific tissues.

This classification system is technical, but it reveals why collagen supplements aren’t interchangeable. Each family serves a different architectural purpose in your body.

Which Type of Collagen Should You Take?

The right collagen type depends entirely on your goal. There’s no single “best” type, only the one that matches your target tissue:

But if your main concern is joint pain, a Type II supplement is the more targeted choice — no matter how comprehensive a multi-type blend claims to be.

What Actually Breaks Down As You Age

Your body’s own collagen production slows steadily after your mid-20s. By middle age, that decline shows up as wrinkles, creaky joints, and slower wound healing. The genes that encode collagen — like COL2A1, which carries the instructions for Type II collagen — remain intact, but less protein gets built.

The Cleveland Clinic notes that this natural decline is why collagen supplements became so popular in the first place. Your body can’t absorb whole collagen directly; dietary collagen gets broken into peptides, which then signal your body to rebuild its own supply. That’s why the type matters — different peptides send different signals.

One honest caveat: research on collagen supplements is still evolving. A source like this Cleveland Clinic overview of collagen explains the mechanism clearly if you want the full picture.