With a long list of scientific credentials and heralded by celebrities and hairdressers alike (Hailey Bieber, Rihanna and Selena Gomez are all reported to be fans), K18 is a haircare brand that has recently taken the beauty industry by storm. The K18 hair mask went viral on TikTok earlier this year (more on that below) and now the brand has launched two new shampoos to the line-up.

Promising stronger, healthier hair, the two shampoos – Peptide Prep™ Detox Shampoo and Peptide Prep™ pH Maintenance Shampoo – are designed with damage prevention at their core, while also helping to increase the efficiency of the cult K18 Leave-In Molecular Hair Mask.

So, how do the K18 shampoos and cult hair mask fare under the Stylist beauty team’s beady eyes? Read on for Stylist’s beauty editor Morgan Fargo’s full K18 hair mask review, plus beauty contributor Chloe Burcham’s thoughts on the two brand new shampoos, as well as a full explanation of how the science behind the range works and how often to use them.

“I tried the genius K18 hair range Hailey Bieber swears by, and here are my honest thoughts”