The 5 main types of collagen and what they do in your body
Collagen is the most abundant protein in the human body. It makes up about one-third of your total protein content and plays a critical role in the health of your skin, joints, bones, muscles, tendons, ligaments, and even your gut lining. Think of collagen as the “glue” that holds everything together. Without it, your tissues would lose their structure, strength, and elasticity.
But here’s the thing: not all collagen is the same. Scientists have identified at least 28 different types of collagen, but five main types (Type I, II, III, IV, and V) make up the majority of what’s found in your body. Each type has its own unique role and distribution.
In this article, we’ll explore these 5 main types of collagen, their functions, where they are found in your body, and how they can be supported through diet, lifestyle, and supplementation.
What Is Collagen? A Quick Refresher
Before diving into the different types, let’s start with the basics. Collagen is made of amino acids — mainly glycine, proline, and hydroxyproline — which link together to form a triple-helix structure. This structure is what gives collagen its strength and flexibility.
As you age, your body naturally produces less collagen. This decline typically begins in your mid-20s and accelerates in your 40s and 50s. Factors like sun exposure, smoking, high sugar intake, and stress can speed up this breakdown. The result? Wrinkles, sagging skin, joint stiffness, brittle nails, and hair thinning.
That’s why collagen has become one of the most popular supplements worldwide. But to truly understand collagen’s benefits, you need to know the different types and their specific roles.
The 5 Main Types of Collagen
1. Type I Collagen – The Most Abundant
Where it’s found:
Skin
Bones
Tendons
Ligaments
Teeth
Scar tissue
What it does:
Type I collagen makes up about 90% of your body’s collagen. It’s the “workhorse” that provides structure to skin, bones, and connective tissues. This type is especially important for skin elasticity and hydration.
When you think about anti-aging benefits like reducing wrinkles or improving skin firmness, Type I collagen is the main player. It also strengthens bones, helps repair tissues, and supports tendon and ligament health.
Health benefits of Type I collagen:
Improves skin texture and elasticity
Reduces fine lines and wrinkles
Speeds up wound healing
Strengthens bones and prevents fractures
Supports nail and hair growth
Best sources:
Marine collagen (fish-based) is particularly rich in Type I collagen.
Bovine collagen (from cows) also contains Type I.
2. Type II Collagen – The Joint Protector
Where it’s found:
Cartilage
Joints
What it does:
Type II collagen is the main component of elastic cartilage, which cushions joints and helps them move smoothly. Without healthy Type II collagen, cartilage wears down, leading to stiffness, pain, and conditions like osteoarthritis.
This is the collagen type most associated with joint health supplements. Research shows that Type II collagen supplementation may reduce inflammation in the joints and even improve mobility in people with arthritis.
Health benefits of Type II collagen:
Protects cartilage and reduces joint pain
Improves flexibility and mobility
May reduce inflammation in arthritis
Supports long-term joint health in athletes and older adults
Best sources:
Chicken collagen (especially from chicken sternum cartilage) is high in Type II.
Specialized supplements often provide undenatured Type II collagen (UC-II®) for joint health.
3. Type III Collagen – The Organ and Vessel Supporter
Where it’s found:
Skin
Blood vessels
Intestines
Uterus
Muscles
What it does:
Type III collagen is often found alongside Type I collagen. It’s particularly important for the elasticity of organs and tissues. This type supports the structure of arteries and other blood vessels, helping maintain cardiovascular health.
In the gut, Type III collagen helps strengthen the intestinal wall and may play a role in preventing leaky gut syndrome. For women, it also supports uterine tissue and can play a role in reproductive health.
Health benefits of Type III collagen:
Supports healthy circulation and strong blood vessels
Helps maintain firm, youthful skin
Promotes gut lining integrity
Aids in muscle structure and repair
Best sources:
Bovine collagen (from cows) is rich in both Type I and Type III.
Many multi-collagen supplements combine these types for skin and gut health.
4. Type IV Collagen – The Filter and Foundation
Where it’s found:
Skin layers (basement membranes)
Kidneys
Other organ linings
What it does:
Type IV collagen is less talked about but extremely important. It forms thin sheets in the basement membranes — delicate layers that separate and protect different tissues and organs.
In the skin, Type IV collagen provides a foundation for the growth of new cells. In the kidneys, it helps with filtration. Essentially, this type of collagen acts as a supportive layer between tissues, ensuring stability and proper function.
Health benefits of Type IV collagen:
Supports healthy skin structure and regeneration
Plays a key role in kidney filtration
Provides structural support for organs
Best sources:
Type IV collagen is naturally harder to get from food or supplements.
Multi-collagen supplements may provide trace amounts.
5. Type V Collagen – The Tissue Organizer
Where it’s found:
Corneas (eyes)
Hair
Placenta
Skin
Tissues around organs
What it does:
Type V collagen is essential for forming and organizing collagen fibrils, especially in combination with Type I. It plays a crucial role in eye health (corneal transparency), reproductive health (placenta formation during pregnancy), and hair growth.
Health benefits of Type V collagen:
Supports healthy vision by maintaining cornea structure
Plays a role in fertility and pregnancy health
Aids in skin and hair growth
Works with Type I collagen for tissue strength
Best sources:
Type V collagen is most commonly found in multi-collagen supplements.
Collagen Supplements: Do They Work?
Research shows that hydrolyzed collagen (collagen peptides) is well absorbed by the body. Once digested, the amino acids and peptides travel through the bloodstream and stimulate collagen production where it’s needed most — skin, joints, bones, and connective tissues.
Types of collagen supplements available:
Bovine collagen → Rich in Type I & III (skin, bones, gut).
Marine collagen → High in Type I (skin, hair, nails).
Chicken collagen → Rich in Type II (joints).
Multi-collagen blends → Contain Types I, II, III, V, and X for full-body support.
How to Boost Collagen Naturally
Besides supplements, you can support collagen production by:
Eating a diet rich in protein (chicken, fish, eggs, beans).
Getting enough vitamin C (essential for collagen synthesis).
Consuming zinc and copper (important cofactors).
Limiting sugar and processed foods (which damage collagen).
Protecting your skin from UV exposure.
Common Questions About Collagen
Q: At what age should I start taking collagen?
A: Collagen production starts to decline in your mid-20s. Many people begin supplementation around age 25–30, but it can benefit you at any age.
Q: How long does it take to see results?
A: Studies suggest you may notice improvements in skin hydration and elasticity within 8–12 weeks, while joint benefits may take 3–6 months.
Q: Can men take collagen?
A: Absolutely! Collagen is not just for women. Men benefit from stronger joints, muscles, bones, and skin as well.
Final Thoughts
Collagen is one of the most important proteins in your body, supporting everything from glowing skin and shiny hair to strong joints, healthy organs, and resilient blood vessels. While there are many types of collagen, the five main ones — Type I, II, III, IV, and V — each play unique and essential roles.
Whether you’re interested in anti-aging, joint support, gut health, or overall wellness, collagen is worth paying attention to. Supporting your body’s collagen production through diet, lifestyle, and supplements can help you look and feel healthier at every age.
✨ If you’re considering supplementation, look for high-quality collagen peptides or multi-collagen blends to cover the broadest range of benefits.