K18

Two scientists spent eight years searching for a specific sequence of amino acids that would restore broken bonds inside damaged hair. They found a short chain called the K18 peptide, patented it, and launched a hair care brand around a single four-minute leave-in. Treatment. Suveen Sahib and his co-founder, Britta Cox, launched K18 in 2020 after an eight-year research program to identify a peptide that could reconnect disulfide, peptide, and hydrogen bonds broken by bleaching, coloring, and heat styling. The K18 peptide was engineered in the lab and patented, and the launch product was an unusually simple four-minute leave-in hair treatment with no rinse step. The minimalist application ritual was the commercial lever. Hair repair products are historically a weakness in bathroom routines because they require a rinse step, multiple steps layered together, or a long-sit time that customers rarely actually follow.