Types of Collagen: What They Do and How to Choose the Right Supplement

What Is Collagen?

Collagen is the most abundant structural protein in your body. According to Cleveland Clinic, it accounts for about 30% of your body’s protein, providing structure, strength, and support across virtually every tissue. Think of it as the scaffolding that holds everything together, from the plumpness in your cheeks to the cushion in your knees.

Where Collagen Works in Your Body

Collagen does not concentrate in one place. It is distributed across nearly every system you rely on daily:

• Skin: Collagen supports elasticity and a smooth, resilient texture.
• Joints: It forms the cartilage that keeps movement comfortable and low-friction.
• Bones: Collagen gives bones flexibility alongside their mineral hardness.
• Tendons, ligaments, and blood vessels: All rely on a steady collagen supply to stay strong and functional.

When collagen production is robust, these tissues do their jobs quietly and efficiently. When it starts to decline, you may notice skin that looks less firm and joints that feel stiffer than they used to.

How Collagen Is Built

Collagen has a distinctive triple helix structure, made of three protein chains wound together. Its main building blocks are the amino acids glycine, proline, and hydroxyproline. Cleveland Clinic notes that your body also needs vitamin C, zinc, copper, and manganese to form that triple helix, which is why nutrition plays such a direct role in collagen health.

How Many Types of Collagen Are There?

Scientists have identified around 28 types of collagen. When you hear “collagen,” you probably picture skin firmness or joint cushioning, but this protein family is far more diverse than a single function can capture.

Fibrillar and Network-Forming Collagens

Each type differs at the molecular level, which determines where it ends up in your body and what job it performs there. Types I, II, and III are fibrillar collagens, meaning they form long, rope-like fibers that provide tensile strength. Type IV, by contrast, forms sheet-like layers within basement membranes, the thin supportive layers beneath skin and around organs.

The Five Main Types at a Glance

Cleveland Clinic identifies five main types that do most of the work in the body:

Other types appear in smaller amounts but still matter. According to Orthobullets, Type X is found in the deep calcified layer of cartilage, while Types IX and XI help form the collagen lattice that supports joint cartilage.

Key Types of Collagen and Their Functions

Knowing that your body contains 28 collagen types is one thing. Knowing which ones affect how your skin looks and how your joints feel is another.

Type I Collagen

Type I is the structural workhorse of the human body. It makes up about 90% of your body’s collagen and forms the dense fibers that give skin its firmness, bones their strength, and tendons their ability to handle load. It is also the most common focus of collagen supplements designed to support healthy-looking skin.

Type II Collagen

Type II lives primarily in cartilage, the cushioning tissue that keeps joint movement smooth. A 2024 review in Biosciences Biotechnology Research Asia notes that Type II makes up roughly 60% of the dry weight of cartilage. If your knees ache after a workout or your hips feel stiff in the morning, Type II is often part of the conversation.

Type III Collagen

Type III works alongside Type I and is found in muscles, arteries, and organs. Orthobullets also lists it in skin and blood vessels. Its softer, more pliable fibers support the structure of blood vessel walls and internal tissues, which is why many formulas combine Types I and III.

Type IV Collagen

Unlike the fibrous types above, Type IV forms sheet-like layers in basement membranes, including those within the skin. These layers help support the skin’s structure and the boundary between its layers.

Type V Collagen

Type V appears in smaller amounts in the cornea, some layers of skin, hair, and placental tissue. It helps organize the fibers formed by other collagen types so that collagen networks form properly.

What Affects Collagen Production?

Your body makes collagen constantly, but not at the same rate forever. Cleveland Clinic explains that your body produces less collagen as you age, and existing collagen breaks down faster. Several factors influence how quickly that happens.

Age and Menopause

Collagen levels fall with age, and the remaining fibers become thinner and weaker, according to Medical News Today. Hormones also play a role. Cleveland Clinic notes that women experience a significant reduction in collagen production after menopause, which can show up as thinner skin and changes in joint and bone health.

Sun Exposure

Ultraviolet radiation breaks down collagen in the skin. Cleveland Clinic states that too much sunlight reduces collagen production and causes collagen to break down more rapidly. Daily SPF is one of the simplest ways to protect the collagen you have.

Smoking

Smoking decreases collagen production and introduces oxidative stress that damages collagen and elastin. The visible result is often premature lines and a dull, uneven skin tone.

High Sugar Intake

Excess sugar can attach to proteins, including collagen, to form advanced glycation end products. This process makes collagen fibers stiffer and weaker, which can accelerate visible signs of skin aging.

Nutritional Gaps

Vitamin C is essential for collagen synthesis, and Medical News Today notes that a severe lack of it can lead to scurvy. Zinc, copper, and amino acids like glycine and proline also play supporting roles. A diet consistently low in these nutrients leaves your body without the raw materials it needs.

Does Collagen Supplementation Work?

This is where it is important to be realistic. The research is encouraging in some areas, but it is still developing.

What the Research Shows

Cleveland Clinic reports that limited studies suggest collagen peptides are possibly effective for improving skin hydration and elasticity. For joints, Medical News Today describes a 2018 trial of 120 people in which those taking oral collagen for 90 days saw joint pain fall by 43% and joint mobility improve by about 39% compared with placebo. For bones, the 2024 review cites a trial of 102 postmenopausal women in which 5 g of collagen peptides daily for a year improved bone mineral density compared with placebo.

The Limits of the Evidence

The Harvard T.H. Chan School of Public Health notes that some randomized controlled trials have found improvements in skin elasticity and joint mobility, but that much of the research is funded or partly funded by related industries. It also explains that digested collagen is broken down into amino acids, which the body then uses wherever protein is needed. Cleveland Clinic adds that there is a lack of randomized controlled trials on dietary supplements overall.

In short, collagen supplements are a reasonable addition to a healthy routine, especially for skin and joint support, but they work best alongside good nutrition, sun protection, and realistic expectations.

ALSO READ: Collagen in Pregnancy: Potential Benefits and Safety

How to Choose the Right Collagen Supplement

The real question is not just whether collagen supplements work. It is which formula delivers the right types for your goals.

Match the Type to Your Goal

If firmer, more hydrated-looking skin is your focus, look for a formula that includes Type I collagen, the dominant structural protein in the skin. For joint comfort and mobility, Type II is the most relevant choice. If you want broader support, a multi-type formula that combines several types covers the widest range of needs.

Understand Collagen Sources

Different sources provide different types. Bovine collagen is typically associated with Types I and III, marine collagen with Type I, and chicken collagen with Type II. A formula that combines several sources can deliver a broader mix of collagen types in one product.

What to Look For on the Label

• Hydrolyzed collagen peptides: Collagen broken into smaller peptides is the most common form used in supplements and research.
• Clear collagen types and sources: A good label tells you which types are included and where they come from.
• Quality standards: Look for GMP manufacturing and third-party testing. Harvard notes that supplements can contain heavy metals and that the FDA does not review supplements for safety or effectiveness before they are sold.
• Minimal additives: Non-GMO, gluten-free formulas without artificial additives keep things simple.
• A fair guarantee: Results take time, so a money-back guarantee lets you try a product with less risk.

Support Collagen Through Your Diet

Whatever supplement you choose, pair it with foods that supply vitamin C, zinc, and protein. Harvard lists tough cuts of meat, fish with skin and bones, bone broth, and gelatin as natural collagen sources.

Top Pick: WOWMD Collagen Complex

WOWMD Collagen Complex: Best Multi-Type Collagen Formula

Pros:

• Hydrolyzed collagen peptides providing Types I, II, III, V, and X
• Combines bovine, chicken, marine, and eggshell membrane collagen sources
• Non-GMO, gluten-free, and free of artificial additives
• Made in the USA in a GMP facility with third-party lab-tested ingredients
• 60-day money-back guarantee for first-time customers

Cons:

• Results build gradually and require consistent daily use
• Does not include vitamin C, so pair it with a vitamin C-rich diet

Key ingredients: Bovine, Chicken, Marine, and Eggshell Membrane Collagen Peptides | Format: Capsules | Rating: 4.8/5 from 210 verified reviews

WOWMD Collagen Complex brings five collagen types together in one easy capsule, supporting skin elasticity and healthy-looking skin, joint comfort and mobility, and hair and nail wellness. Because it draws on multiple sources, it covers the types most linked to skin (I and III), cartilage (II and X), and fiber organization (V). First-time customers buying a single bottle are covered by a 60-day money-back guarantee, giving you time to see how it fits your routine.

"These capsules are super easy to fit into my morning routine. I like that I can take them with my other daily wellness habits without making things complicated." - Lauren M

†These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary.

Final Thoughts

Collagen is the scaffolding behind your skin, joints, bones, and connective tissue, and your body makes less of it with time. You cannot stop that process, but you can slow the factors that speed it up by protecting your skin from the sun, avoiding smoking, limiting excess sugar, and eating enough protein, vitamin C, and zinc.

If you choose to supplement, look for a formula with clearly labeled collagen types, hydrolyzed peptides, and verifiable quality standards. For a multi-type option that covers skin and joint support in one capsule, WOWMD Collagen Complex is a strong place to start. Give any supplement several weeks of consistent use before judging results.