What is the difference between Type I, II, and III collagen?

In recent years, collagen supplements have become one of the most talked-about topics for skin, joint, and hair health. However, when we say "collagen," we are not talking about a single molecule, but rather many types of collagen that have different functions in our body. In this article, we will scientifically discuss the differences between Type I, II, and III collagen, which are particularly important for skin health, what each type does, and why certain types are preferred in supplements.

What are Collagen Types

Collagen is a structural protein made of amino acids and constitutes approximately 30% of the total protein in the body. So far, 28 different types of collagen have been identified; however, three of these – Type I, Type II, and Type III – make up about 90% of the collagen in the human body. Each collagen type functions in different tissues and has its own unique structure-function relationship.

Type I Collagen: The Foundation of Skin and Bones

Approximately 80% of the collagen in the body is Type I collagen. This type is found especially in the skin, bones, tendons, and connective tissues. Type I collagen has a fibrous structure and provides durability, firmness, and strength to the skin.

·       What it does:

·       Supports skin elasticity and firmness.

·       Helps reduce fine lines and wrinkles.

·       Maintains bone density, strengthens tendons and connective tissues.

Hydrolyzed Type I collagen peptides are commonly used in supplements. This form, due to its small molecular structure, enters the bloodstream after digestion and reaches the skin tissue. Verisol® type peptides, in particular, have been clinically proven to be effective on the skin with their Type I and Type III collagen composition.

Type II Collagen: Joint Supporter

Type II collagen constitutes approximately 10–15% of the body's collagen and is primarily found in cartilage tissue. Therefore, it is the most important type of collagen for joint health.

·       What it does:

·       Protects cartilage structure, reduces friction in joint surfaces.

·       Provides flexibility and mobility in joints.

·       Supportive for athletes or age-related joint conditions.

Type II collagen is usually taken in its undenatured (natural form) because this form can interact with the immune system to reduce inflammation in joint surfaces. However, Type II is generally not used in supplements targeting skin, as its primary effect is on the joints.

Type III Collagen: Skin Elasticity and Softness

Type III collagen is usually found with Type I. It plays an important role in the structure of the skin, muscles, and blood vessel walls. This type of collagen is particularly effective on skin softness, elasticity, and a youthful appearance.

·       What it does:

·       Gives skin a smooth and elastic appearance.

·       Supports vascular and muscle tissues.

·       Works with Type I collagen to strengthen the overall structure of the skin.

Generally, a combination of Type I & III is found together in supplements developed for skin. The synergistic effect of these two types strengthens collagen synthesis and fibroblast activity.

Which Type of Collagen is Most Effective for Skin?

When it comes to skin health, the most effective combination is Type I and Type III collagen. These two types support the fibrous structure in the dermal layer, increase elastin production, and improve moisture balance. High-quality collagen supplements often prefer hydrolyzed peptide forms containing these two types together.

Clinically tested formulas like Verisol® have been scientifically proven to increase collagen density in the skin and reduce the appearance of wrinkles.

Comparison of Type I, II, and III Collagen

Feature	Type I	Type II	Type III
Tissues Found In	Skin, bone, tendon	Cartilage, joints	Skin, blood vessels, muscle
Main Area of Effect	Skin firmness and durability	Joints and mobility	Skin elasticity and softness
Best Use Case	Beauty and anti-aging	Joint health	Beauty and skin support
Form	Hydrolyzed peptide	Undenatured (natural form)	Hydrolyzed peptide
Synergy	With Type III	Glucosamine, MSM	Along with Type I

Conclusion: The Right Type, The Right Purpose

Collagen is a fundamental building block that supports skin firmness, elasticity, and overall appearance. However, not all collagen types have the same effect. The most beneficial for skin are Type I and Type III collagen, while Type II collagen is best for joints. Therefore, when choosing a collagen supplement, it is important to pay attention to which type of collagen the product contains, in what form it is processed (hydrolyzed, Verisol®, etc.), and what scientific references support it. An effective collagen supplement is not just about 'containing collagen,' but about providing the correct types in the correct forms.