Type I builds skin, bone, and tendon, Type II cushions joints, Type III supports organs and vessels, Type IV anchors tissue layers, and Type V regulates how collagen fibers assemble.
A tendon that snaps under load and a knee that aches on stairs both trace back to collagen — the protein family that holds your body together, and it comes in more than one form. Five types get the most attention: Type I, II, III, IV, and V. Each one sits in different tissue and does a different job, which is why the label on a supplement bottle matters more than the marketing on the front.
Here’s what each type does, where it lives in the body, and why the “all five types” claim on a label deserves a closer look.
Type I: The Body’s Most Abundant Collagen
Type I makes up roughly 90% of the collagen in your body. It provides structural strength to skin, bones, tendons, ligaments, and connective tissue, and it does the heavy lifting when you think about collagen at all.
That 90% figure is why Type I dominates nearly every collagen peptide supplement on the market — it’s the easiest type to source and the one most studied for skin and joint support. If a bottle lists only one type, it’s almost always this one.
Type II: The Joint and Cartilage Specialist
Type II is the main collagen in cartilage, the smooth tissue that cushions the ends of your bones. It supports joint structure and flexibility, and it’s the type people chasing knee and hip comfort tend to care about most.
Type II behaves differently from Type I in one practical way: it’s often sold as “undenatured” or “native” Type II, sourced from chicken sternum, because some evidence suggests the intact form interacts with the immune system rather than being fully broken down. That’s a meaningfully different product than a standard Type I powder.
Type III: Skin, Blood Vessels, and Organs
Type III shows up in muscles, arteries, organs, blood vessels, and skin, where it helps form the supportive reticular networks that give soft tissue its shape.
Types I and III frequently travel together — you’ll often see them listed as a pair on supplement labels, since both are found in skin and connective tissue. Type III is also the type that increases early in wound healing before Type I takes over.
Type IV and Type V: The Structural Support Crew
Type IV forms basement membranes — thin anchoring layers of skin and tissue that filter and separate cells — while Type V is found in the cornea, hair, some skin layers, and the placenta, where it helps regulate how collagen fibrils assemble.
These two are far less abundant than Types I, II, and III, and they’re rarely the headline on a supplement label. They matter structurally, but no realistic oral collagen dose delivers them in meaningful amounts to a specific tissue. That’s worth knowing before you pay a premium for “all five types.”
The 5 Types of Collagen at a Glance
| Collagen Type | Where It Lives | Main Job |
|---|---|---|
| Type I | Skin, bones, tendons, ligaments | Structural strength (about 90% of body collagen) |
| Type II | Cartilage | Joint cushioning and flexibility |
| Type III | Muscles, arteries, organs, blood vessels, skin | Supportive reticular networks in soft tissue |
| Type IV | Basement membranes and skin layers | Scaffolding and filtration between tissue layers |
| Type V | Cornea, hair, some skin layers, placenta | Regulates collagen fibril assembly |
Cleveland Clinic’s overview of collagen and a peer-reviewed table of collagen types both confirm this breakdown, and both note the same caveat: “collagen” refers to a whole family of proteins, and these five are simply the most discussed human types.
Do You Actually Need All Five Types in a Supplement?
Not necessarily — and the honest answer depends on what you’re trying to support. Most clinical research on collagen peptides centers on Types I and II, which is why those two dominate the evidence base. Type III often appears alongside Type I in bovine or marine sources.
Types IV and V appear in food-derived collagen simply because they exist in the animal tissue being processed — not because a manufacturer engineered a targeted dose. If joint comfort is your goal, Type II deserves the focus. If skin and general connective tissue are the target, Type I and III are the ones to look for. a tested roundup of all-five-type collagen products breaks down which formulas actually list meaningful amounts.
One more caveat worth repeating: supplement pages often map body functions directly onto specific collagen types, and those generalizations aren’t always backed by clinical evidence. Treat the “does” in any label claim as a starting point, not a promise.
Common Questions
Which collagen type is best for joint pain?
Type II is the collagen found in cartilage, so it’s the type most relevant to joint cushioning and flexibility. Look for “undenatured” or “native” Type II, often sourced from chicken sternum, which is the form studied for joint comfort. Type I aids in skin and bone, not cartilage.
Are there collagen types beyond these five?
Yes. The body contains at least 28 known collagen types. The “five types” framing refers to the ones most commonly discussed for human tissue, but others exist and play roles in everything from eye structure to organ development. Most of them aren’t commercially available in supplement form.
Does taking collagen with all five types work better?
Not automatically. A broader label doesn’t guarantee a better product. What matters more is the dose and the type most relevant to your goal. Because types IV and V are naturally low in the body, adding them to a formula doesn’t necessarily add benefit.
Sources
- Cleveland Clinic. “Collagen: What It Is, Types, Function & Benefits.” Confirms the five main types and their locations in the body.
- PubMed Central. “Collagen Types and Their Tissue Distribution.” Peer-reviewed table detailing each type’s structure and role.
- Boston University. “Collagen Types and Disorders.” Reference guide on collagen types and related tissue disorders.