In the world of haircare, innovation is key, and K18PEPTIDE™ is leading the charge. Trusted by experts and beloved by beauty editors, this revolutionary ingredient repairs hair at the molecular level, targeting multiple types of bonds—including polypeptide chains and disulfide bonds—to reverse pre-existing and ongoing damage caused by bleach, color treatments, chemical services, and heat.

But what exactly is it, and does it work for all hair types? More importantly, do its impressive claims hold up under scrutiny? In short, yes. 

Read on for a fresh primer on our favorite, clinically-proven, proprietary ingredient.

what is K18PEPTIDE™?

Developed in a lab using advanced biotechnology, K18PEPTIDE™ is uniquely designed to work in harmony with human biology. A biomimetic molecule, it seamlessly integrates with the hair's keratin structure, effectively reconnecting damage sites at the molecular level. The result? Durable repair that restores strength and elasticity where it matters most to all hair types.  

what makes it so special?

K18 is committed to a less-is-more philosophy, so K18PEPTIDE™ was intentionally designed to simplify and minimize routines. With just four minutes of application time and no extra steps required (i.e. rinsing or subsequent products), you’ll see results from the very first use.

how do I use it?

For industry PROs, K18PEPTIDE™ is available in the K18REPAIR™ service, which includes the K18 professional molecular repair hair mask and the PRO molecular repair hair mist. This service is designed to provide intense repair in a salon setting, ensuring that clients leave with healthier, more resilient hair.

For at-home care, everyone can find K18PEPTIDE™ in the molecular repair hair mask and molecular repair hair oil. These products allow you to continue the repair process between salon visits and protect hair from daily ongoing damage (think: heat, mechanical damage, and environmental stressors).