The Science of Keratin

Keratin is an ingredient you’ll find in countless haircare products — and increasingly in skin and nail formulations too. Celebrated for its restorative and strengthening properties, it is one of the most talked-about ingredients in modern beauty. But understanding what keratin actually does, and how to use it correctly, makes all the difference.

In this guide, we break down what keratin is, what it does for your hair and skin, and how to incorporate it responsibly into your routine for a smoother, stronger-looking result.

Keratin is a naturally occurring structural protein produced by your body. It is a fundamental building block of your hair, skin, and nails — providing strength, structure, and protection.

When hair becomes damaged through heat styling, colouring, sun exposure, or chemical treatments, its keratin structure can become weakened. The result is hair that feels drier, more brittle, frizzier, and less luminous.

In haircare, keratin is used to temporarily support damaged hair by helping the hair surface feel smoother and more resilient. The result is hair that looks healthier, shinier, and easier to manage.

• Supports the hair fibre and visible strength
• Helps reduce frizz and flyaways
• Adds smoothness and visible shine
• Improves the look of dry, damaged lengths
• Creates a softer, more polished finish

In skincare, keratin plays a different but equally important role. As a naturally occurring component of the skin, it contributes to barrier protection, firmness, and structural integrity.

While keratin is less commonly used as a direct skincare active than in haircare, the principle remains the same: healthy structure needs balance. That is why the SKINLY approach combines strengthening ingredients with hydration, barrier support, and daily protection.

1. Don’t overdo treatments

   Professional keratin treatments can be effective, but over-treating may weigh hair down or leave it feeling dry. Give your hair time between intensive treatments.

2. Always combine with hydration

   Keratin supports strength, but it does not automatically moisturise. Use a nourishing conditioner or mask alongside keratin-based products.

3. Choose gentle formulas

   A daily routine should feel effective but refined. Choose formulas that cleanse, soften, and support the hair fibre without unnecessary harshness.

4. Protect your hair afterwards

   To maintain smoother-looking hair, keep your routine gentle:

   • Use a mild shampoo
   • Apply conditioner through the lengths
   • Use a hair mask when your hair feels dry
   • Protect your hair before heat styling