From Skin to Scalp: COSRX’s Big Step Into Haircare 

If you know COSRX, you know it’s the brand that takes skincare seriously—results without fuss, science without the irritation. But what happens when that skin-first philosophy meets your hair? The answer: COSRX’s very first haircare line, built around a one-of-a-kind ingredient—PEPTIDE-132, the world’s only patented keratin-bonding peptide.

Why Hair, Why Now?

Beauty trends don’t stand still. First came Glass Skin, now it’s Glass Hair—smooth, reflective strands that shine with health, not just styling spray. Social media is full of it, and consumers are asking for more than surface-level fixes. They want products that repair damage at its root. Literally.

That’s where COSRX comes in. With the belief that hair is an extension of the skin, the brand is bringing its signature science into a new territory—your scalp and strands.

Meet PEPTIDE-132: A Puzzle Piece for Hair

So what makes this peptide special? Think of your hair like a complex building, made of keratin bricks. Heat styling, coloring, and UV rays knock out pieces, leaving weak spots. PEPTIDE-132 was engineered—through advanced AI molecular modeling—to fit back into those missing spaces like a perfect puzzle piece.

Here’s why it works:

• Tiny but mighty: At just 384.9 Daltons, it’s small enough to slip past the cuticle and into the hair’s cortex.

• Smart design: Three amino acids arranged to bind with keratin and strengthen it.

• Proven grip: Out of thousands of candidates, it showed the strongest binding to damaged keratin.

The result? Reinforced bonds deep inside the hair, not just a coating on the outside.

Science That Shows

Lab tests confirmed what the models predicted. Hair treated with PEPTIDE-132 saw an 11.1% boost in tensile strength, making it more resilient against daily stress. In brushing simulations, treated strands broke far less—even after hours of wear.

And it doesn’t stop inside the hair. On the surface, PEPTIDE-132 seals lifted or cracked cuticles, smoothing texture, locking in hydration, and giving hair that polished, glossy finish.

The Routine: Simple, Yet Professional

The new Ultra Perfect Hair Bonding line translates this science into three easy steps:

• Peptide-132 Ultra Perfect Hair Bonding Shampoo: Cleanses buildup, soothes the scalp, and starts bond repair. [GO SHOP NOW]

• Peptide-132 Ultra Perfect Hair Bonding Treatment: A creamy repair boost that replenishes protein and moisture. [GO SHOP NOW]

• Peptide-132 Ultra Perfect Hair Bonding Oil Serum: Lightweight shine and frizz control, with no greasy residue. [GO SHOP NOW]

Think of it as a professional treatment you can do at home, without the salon appointment.