Leave-in Molecular Repair Hair Mask

K18's patented molecular leave-in treatment that reconnects broken keratin chains and reverses bleach and heat damage in just 4 minutes without rinsing.

K18 Biomimetic Hairscience's Leave-In Molecular Repair Hair Mask is a revolutionary, science-backed leave-in treatment powered by the brand's patented K18Peptide™ technology — engineered to reconnect broken keratin chains inside the hair cortex and reverse damage from bleach, colour, chemical services and heat in just 4 minutes. Unlike traditional masks, this game-changing leave-in formula works at a molecular level to restore strength, softness, smoothness and elasticity from the inside out without rinsing.

Hydrolysed Keratin: molecular-level keratin fragments that penetrate the hair cuticle to rebuild broken protein bonds, dramatically improving strength and reducing breakage

Hydrolysed Collagen: small collagen peptides that fill structural gaps in the hair shaft, improving elasticity and preventing snapping during styling

Panthenol (Pro-Vitamin B5): attracts and binds moisture into the hair fibre, smoothing the cuticle and transforming dry, rough hair into a silky, manageable texture

Argan Oil: penetrates into the hair cortex to provide deep conditioning and high shine while protecting the repaired hair from further heat or mechanical damage

Biotin: supports the hair's keratin infrastructure, contributing to stronger, more resilient strands that resist damage from daily manipulation and environmental exposure

Step 1: Begin by shampooing your hair and thoroughly rinsing it. Avoid using conditioner.
Step 2: After washing, towel dry your hair to remove excess moisture. Then, apply the mask evenly to your hair, making sure to leave it in for a duration of 4 minutes. There's no need to rinse it out during this time.
Step 3: Once the 4 minutes have elapsed, you can proceed to apply any desired styling products. Afterward, dry and style your hair as you normally would.