PEPTIDE-132™ is a patented repair peptide designed to protect and strengthen damaged hair. It bonds like puzzle pieces to keratin, filling in weakened areas and holding other beneficial ingredients in place. Made of three amino acids, this small-sized peptide (384.9 Da) penetrates deep into the hair cortex to repair broken bonds caused by physical and chemical damage. This helps restore hair strength and improves overall hair health.

Yes. The Peptide-132 line is especially beneficial for chemically treated, bleached, heat-damaged, or over-processed hair. It helps support weakened hair structure and improve resilience.

While each product is clinically effective on its own, using the full PEPTIDE-132™ routine delivers significantly better results. In a 4-week clinical study, the 3-step routine (Shampoo, Treatment, and Oil Serum) improved hair protein bonding by 2.7x and softness by 1.8x compared to using a single treatment. This step-by-step routine repairs, strengthens, and protects, leaving hair visibly healthier and scalp balanced.

The PEPTIDE-132™ products are infused with COSRX’s signature “Green Ivy” scent — a fresh, citrusy, and woody fragrance. Inspired by serene bamboo forests, it opens with crisp green notes and finishes with soft, clean woods. This subtle, gender-neutral scent is loved globally for its light and calming feel.