Collagen & Your DNA: Why the Type You Choose Matters More Than You Think

Whilst in the hair salon last week I overheard a stylist and her client talking about collagen. They’d both tried the same collagen supplement hoping for better skin. One of them saw a real improvement. The other saw nothing at all.

Collagen is one of the most talked‑about supplements for skin, joints, and overall vitality. But what most people don’t realise is that your DNA plays a major role in how well you use different types of collagen and which type your body is naturally more responsive to.

When they asked me why, the answer was simple: collagen isn’t one‑size‑fits‑all. Your DNA influences which type your body responds to and which type won’t make much difference at all.

Choosing collagen isn’t about trends or guesswork. It’s about understanding your biology.

This Insight explains the three main collagen types, how your DNA influences your needs, and includes examples of collagen products so you can see what each type looks like in practice.

The Three Main Collagen Types

Type I — Skin, Hair, Nails & Connective Tissue

This is the most abundant collagen in the body.
It supports:

Skin firmness and elasticity

Hair and nail strength

Connective tissue repair

Most Type I collagen supplements are marine‑based, offering small peptides that are easy to absorb.

Type II — Joints & Cartilage

Type II collagen is found in:

joint cartilage

cushioning tissues

the structures that support movement

It’s often chicken‑derived and is typically used for joint comfort and mobility.

Type III — Skin Structure & Gut Lining

Type III works closely with Type I and supports:

skin elasticity

tissue repair

gut lining integrity

Many Type I + III blends are bovine‑based.

How Your DNA Influences Collagen Needs

Your DNA doesn’t tell you which collagen to buy but it does reveal the underlying patterns that shape how your body builds, maintains, and repairs collagen.

Here are the key pathways:

1. Collagen Breakdown Genes

Some people naturally break collagen down faster due to variants in collagenase or matrix‑remodelling genes.

These individuals often benefit more from Type I + III, which support skin structure and repair.

2. Inflammation & Connective Tissue Genes

Variants affecting inflammatory pathways or connective tissue integrity can influence joint comfort.

These people may respond better to Type II collagen, which supports cartilage and joint cushioning.

3. Skin Ageing Pathways

Genes linked to:

glycation

oxidative stress

reduced collagen synthesis

…can affect how quickly the skin loses firmness.

Understanding these pathways helps you choose the collagen type that aligns with your biology.

4. Gut Lining & Mucosal Integrity

Some people have a naturally more delicate mucosal lining.

Type III collagen can be particularly supportive for tissue repair and gut comfort.