Type I vs Type III Collagen: What's the Difference?
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If you've been reading collagen supplement labels, you've probably noticed Type I and Type III listed together more often than not. That's not a coincidence, these two collagen types work closely together in the body, but they aren't identical, and understanding the difference helps you know exactly what you're getting from a supplement.

Collagen Type I: The Structural Powerhouse
Type I collagen is the most abundant collagen in the human body, accounting for roughly 90% of your body's total collagen. It's known for being dense and strong, which is why it's found in tissues that need structural integrity:
- Skin, providing firmness and reducing sagging
- Bones, forming part of the mineral matrix
- Tendons and ligaments
- Blood vessels
Because Type I collagen fibers are thick and tightly packed, they're largely responsible for skin's firmness and resistance to stretching. When Type I collagen declines with age, the visible result is often sagging skin, deeper wrinkles, and reduced bone density over time.
Collagen Type III: The Support and Elasticity Layer
Type III collagen is the second most abundant type and is almost always found alongside Type I, rather than on its own. It's more elastic and finer in structure, and is concentrated in:
- Skin, working alongside Type I to add elasticity and suppleness
- Blood vessel walls
- Muscles and internal organs
While Type I gives skin its firmness, Type III is more responsible for skin's elasticity and youthful bounce. This is why skin that looks not just firm but also smooth and supple typically has healthy levels of both types working together, not just one.

Key Differences Between Type I and Type III Collagen
The clearest way to understand the difference is by function rather than just location:
- Type I is thicker and more rigid, providing strength and structure
- Type III is thinner and more elastic, providing flexibility and suppleness
- Type I is more dominant in bones and tendons, where rigidity matters most
- Type III is more concentrated in skin, blood vessels, and organs, where flexibility matters most
- Both types decline together with age, since their production is regulated by overlapping biological processes
Because they work as a team rather than in isolation, a decline in one is usually accompanied by a decline in the other, which is part of why supplements rarely isolate just one of these two types.
Why They're Almost Always Combined in Supplements
Given how closely Type I and Type III work together in the skin specifically, most collagen supplements formulated for skin health include both rather than isolating one. Taking only Type I without Type III, or vice versa, would mean supporting structure without elasticity, or elasticity without firmness, neither of which reflects how skin actually functions.
This is one reason multi-collagen formulas like Carbamide Forte Multi-Collagen Tablet combine Type I and Type III together, along with other collagen types, rather than offering just one in isolation. The goal is to support both the structural firmness and the elasticity of skin at the same time, rather than addressing only half of the picture.

Do You Need Both Types, or Just One?
For most general health and skin goals, both types matter together:
- If your main concern is firmness and reducing sagging, Type I plays the larger role
- If your main concern is skin suppleness and elasticity, Type III plays the larger role
- If you want overall skin quality improvement, both types working together typically produce better results than either alone
This is why a combined approach, such as what's included in Carbamide Forte Multi-Collagen Tablet, tends to be a more practical choice for people who aren't trying to isolate one very specific, narrow concern.
FAQ
Q) What is the main difference between Type I and Type III collagen?
A) Type I collagen is thicker and provides structural firmness to skin, bones, and tendons, while Type III collagen is more elastic and supports skin suppleness, blood vessels, and muscles.
Q) Do Type I and Type III collagen work together?
A) Yes. They're almost always found together in skin tissue, with Type I providing firmness and Type III providing elasticity, functioning as a team rather than independently.
Q) Which collagen type is better for wrinkles, Type I or Type III?
A) Type I is more directly linked to skin firmness and structural support, but both types typically decline together with age, so supplements usually combine them for more complete skin support.
Q) Can I take only Type I or only Type III collagen?
A) Single-type supplements exist, but since these collagen types work together in the body, most people benefit more from a combined formula that supports both structure and elasticity together.
Q) Is Carbamide Forte Multi-Collagen Tablet a good source of both Type I and Type III collagen?
A) Yes, it's formulated to include multiple collagen types, including Type I and Type III, aiming to support skin firmness and elasticity together rather than addressing just one.
Q) Does Type III collagen support anything besides skin?
A) Yes, Type III collagen also plays a structural role in blood vessels, muscles, and internal organs, beyond its contribution to skin elasticity.
Q) At what age does Type I and Type III collagen start declining?
A) Natural collagen production, including both types, typically begins declining gradually from the mid-20s onward, becoming more noticeable in skin texture and firmness by the mid-30s to 40s.