Collagen series: #4 Types of collagen explained: I, II, III, and beyond
Why Not All Collagen Is the Same
When most people hear “collagen,” they think of a single substance — the protein that keeps skin firm and joints strong. But here’s the surprising truth: there are at least 28 different types of collagen in the human body, each with unique structures and functions. Some give skin its bounce, others keep cartilage flexible, and still others hold organs in place.
Understanding the different types of collagen is essential if you want to make smart choices about diet, supplements, and lifestyle. In this chapter, we’ll explore Types I, II, III, and beyond — what they do, where they’re found, and how you can support them naturally.
Collagen Basics: A Quick Refresher
Collagen is a fibrous protein made primarily of glycine, proline, and hydroxyproline. Its triple-helix structure makes it tough and resilient, perfect for supporting tissues. Together, collagen proteins account for about 30% of all the protein in the body.
But the body doesn’t use one single collagen everywhere. It tailors collagen types to the job at hand — just as a builder uses steel beams for skyscrapers and flexible joints for bridges.
Type I Collagen: The Skin, Bone, and Tendon Powerhouse
Where it’s found: Skin, bones, tendons, ligaments, teeth, and connective tissue.
Role: Provides tensile strength and elasticity.
Why it matters: It makes up about 90% of the body’s collagen. This is the type most associated with youthful skin, strong bones, and wound healing.
How to support it:
Eat protein-rich foods (meat, fish, eggs).
Supplement with hydrolyzed collagen peptides.
Ensure vitamin C intake to stabilize collagen fibers.
Type II Collagen: The Cartilage Specialist
Where it’s found: Cartilage in joints, eyes (vitreous humor).
Role: Provides cushion and flexibility, absorbs shock.
Why it matters: Loss of Type II collagen is strongly linked to arthritis, joint pain, and mobility issues.
How to support it:
Choose supplements specifically labeled as Type II collagen (often from chicken sternum).
Include anti-inflammatory foods (omega-3s, turmeric, ginger).
Stay active — movement stimulates cartilage health.
Type III Collagen: The Skin and Vessel Partner
Where it’s found: Skin, blood vessels, muscles, intestines.
Role: Works alongside Type I collagen to support elasticity and structure.
Why it matters: Supports skin plumpness, vascular health, and wound repair.
How to support it:
Prioritize vitamin C and antioxidants.
Consume collagen-rich foods like bone broth.
Use supplements containing Type I and III together (common in bovine collagen).
Type IV Collagen: The Cellular Foundation
Where it’s found: Basement membranes — thin sheets of protein that underlie epithelial and endothelial cells.
Role: Provides scaffolding for cell layers, crucial for filtration (e.g., kidneys).
Why it matters: Supports organ structure and skin barrier function.
How to support it:
Focus on general collagen-building nutrients (amino acids, vitamin C, zinc).
Maintain healthy blood sugar levels to avoid glycation damage.
Type V Collagen: The Specialist in Hair, Placenta, and Eyes
Where it’s found: Hair, placenta, cornea of the eye.
Role: Helps regulate the formation of collagen fibrils.
Why it matters: Contributes to reproductive health, vision, and hair structure.
How to support it:
Balanced diet with amino acids and trace minerals.
Antioxidants to protect delicate tissues like eyes and placenta.
Type X Collagen: The Bone Growth Enabler
Where it’s found: Hyaline cartilage and growth plates of bones.
Role: Crucial for bone formation and repair.
Why it matters: Plays a key role in healing fractures and maintaining bone density.
How to support it:
Adequate calcium, vitamin D, and collagen peptide intake.
Weight-bearing exercise to stimulate bone strength.
How Collagen Types Work Together
Collagen types rarely work alone. For example:
Type I and Type III team up in skin and blood vessels.
Type II and Type X coordinate in cartilage and bone repair.
Type IV supports cell layers that rely on Type I and III for structure.
This synergy is why a balanced collagen intake — rather than a single type — often delivers the best results.
Dietary Sources for Multiple Collagen Types
Bone Broth: Contains Type I, II, and III.
Chicken Skin and Cartilage: Rich in Type II.
Fish Skin and Scales: High in Type I with great bioavailability.
Egg Membranes: Provide Type V and X.
Supplement Strategies by Goal
For Skin & Beauty: Type I + III blends.
For Joints & Cartilage: Type II collagen supplements.
For Bones: Type I + X with calcium and vitamin D.
For Holistic Health: Multi-type collagen powders.
Scientific Research on Collagen Types
Type I & III: Studies show improved skin hydration and elasticity in 8–12 weeks of supplementation.
Type II: Reduces joint pain and stiffness in arthritis patients.
Type X: Promising role in bone fracture healing.
Type IV & V: Emerging research into their roles in organ health and reproduction.
Choosing the Right Collagen for Your Needs
Not all collagen is created equal. Knowing the differences between Types I, II, III, and beyond allows you to choose foods and supplements tailored to your goals — whether that’s glowing skin, stronger joints, or healthier bones.
👉 Want to match the right collagen to your lifestyle? Explore our recommended multi-type collagen supplements here and give your body comprehensive support.
Read collagen series #3 Read collagen series #5
