Hair Care

From Skin Care to Hair Care

We've always seen the scalp as an extension of the skin. Just as your face needs collagen, your hair, made of keratin, needs targeted care too. So COSRX brought more than a decade of skincare science to hair, and created PEPTIDE-132™: a patented bonding peptide that repairs damaged hair from the inside out.

Shop the PEPTIDE-132 line Discover the story

Patented PEPTIDE-132™

Chosen by: Hair professionals at Paris Fashion Week SS26
Clinical result: 2.7× stronger protein bonding*
Works on: Straight, wavy, curly & coily hair
Signature scent: Green Ivy: fresh, citrusy, woody

Paris Fashion Week SS26 · Caroline Hu show

Chosen by hair professionals

From salon chairs to backstage at Paris Fashion Week, the PEPTIDE-132 Ultra Perfect Hair Bonding line is trusted by professionals who need performance they can rely on, show after show.

Hair at the Caroline Hu SS26 show was styled by renowned hairstylist Eugene Souleiman with COSRX. The same salon-quality results are designed to fit easily into your everyday routine.

Trusted and loved by salon experts

When I'm using it, I kind of see it's the next evolution of where hair care should go.
Eugene Souleiman, renowned hairstylist · Paris Fashion Week SS26, Caroline Hu

Why COSRX is expanding into hair care

At COSRX, we have always seen the scalp as an extension of the skin. It has the same layers as the skin on your face, but with more oil glands, more nerves and blood vessels, denser follicles and faster cell renewal. And the hair that grows from it is made almost entirely of one protein: keratin.

Everything we have learned from years of formulating with snail mucin, peptides and gentle actives, we brought to hair care. The result is the PEPTIDE-132™ line, designed to keep your scalp healthy and your hair even healthier.

COSRX PEPTIDE-132 hair bonding shampoo, treatment and oil serum

Chapter 1

How PEPTIDE-132™ was born

It started with a simple question: what if peptides could do for your hair what they have done for your skin?

Peptides transformed skincare by delivering small, targeted building blocks the skin can actually use. PEPTIDE-132™ was born from that idea and, after years of research, it brings strength and shine back to your strands.

Read the hair science guide

Hair damage from UV, heat and chemical treatments

Chapter 2

A deep dive into hair damage

We studied what really breaks hair down: UV rays, heat styling and chemical treatments such as colour, bleach and perms. Each one weakens the bonds that hold keratin together, leaving hair brittle, dull and prone to split ends.

And here is what we found: keratin molecules are too large to penetrate deeply, just like collagen in skin. Applying more keratin only coats the surface. So we thought: let's bring in peptides.

PEPTIDE-132 peptide designed for hair repair

Chapter 3

Creating peptides designed for hair

Not all peptides are created equal. Using AI molecular modelling, the COSRX R&D Center considered more than 20 amino acids and simulated thousands of formulas before landing on one solution: Hair PEPTIDE-132™.

384.9 Da: small enough to pass the cuticle and reach the cortex.
Bonds like a puzzle piece: attaches to weakened keratin and fills the gaps.
Repairs from within: reinforces broken bonds caused by physical and chemical damage.

Your new routine starts here

From gentle cleansing to deep repair, each step in the PEPTIDE-132™ line is made to work in sync with your scalp, your hair and your routine. Use them together for the best results.

Step 1

Ultra Bonding Shampoo

Cleanses and soothes the scalp with PEPTIDE-132, collagen and 18 amino acids while strengthening damaged hair.

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Step 2

Bonding Treatment

A rich, salon-grade treatment that repairs broken bonds and restores softness, shine and elasticity to mid-lengths and ends.

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Step 3

Bonding Oil Serum

A lightweight oil with vitamin E and 7 botanical oils that seals split ends, tames frizz and adds glossy shine without residue.

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Want all three? Get the 3-step Hair Bonding Kit and save.

Real results. Real hair.

Stronger, shinier hair, proven by science and by real users. In a 4-week clinical study, using the full 3-step routine delivered far better results than a single treatment alone.

2.7×

Protein bonding

Improvement in hair protein bonding with the 3-step routine vs. a single treatment.

1.8×

Softness

Softer hair with the full routine compared with using a single treatment.

+11.1%

Tensile strength

Stronger strands measured on damaged hair treated with PEPTIDE-132.

4 weeks

Clinical study

Results measured after four weeks of use in a COSRX clinical study.

*Results from COSRX clinical and in-house laboratory testing. Individual results may vary.

See the difference

Before

Without the routine

Dry, frizzy curls with a rough, uneven texture.

After

With PEPTIDE-132

Defined, glossy curls that look smoother and feel softer.

Q. Is the scalp considered skin too?

A. Yes. The scalp has the same epidermis, dermis and subcutaneous layer as the rest of your skin, but it also has more nerve endings and blood vessels, denser hair follicles, very active sebum production, faster cell turnover and its own microbial balance. That is why it deserves care made for it.

Q. What are hair bonds, and why do they matter?

A. Hair bonds are tiny connections inside each strand that hold keratin together and give hair its strength, elasticity and shape. Heat styling, rough brushing, colouring and sun exposure break them, leaving hair weak, brittle and prone to breakage.

Q. How does PEPTIDE-132™ help hair?

A. It is a patented repair peptide that bonds to keratin like a puzzle piece, filling weakened areas. At just 384.9 Da, it is small enough to reach the cortex and help repair bonds broken by physical and chemical damage.

Q. Is PEPTIDE-132™ suitable for all hair types?

A. Yes. The line is designed for straight, wavy, curly and coily hair. Its ultra-light molecules absorb deeply without leaving residue, and it is gentle enough for daily use.

Q. Do I need the full line to see results?

A. Each product works on its own, but the full 3-step routine delivers significantly better results: 2.7× better protein bonding and 1.8× more softness than a single treatment in a 4-week clinical study.

Q. What does it smell like?

A. The signature Green Ivy scent is inspired by bamboo forests. It opens with crisp green notes and settles into soft, clean woods: subtle, gender-neutral, light and calming.

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