K18

K18: bond-repair haircare backed by biotech

K18 built its name on one standout product: the K18 Leave-In Molecular Repair Mask, a leave-in treatment formulated with a patented bioactive peptide that works to repair the keratin bonds in hair damaged by colouring, heat, or styling. Unlike a rinse-out mask, it keeps working after you've applied it, which is part of why it built such a following. Since then, the range has grown into a full haircare line, including shampoos, conditioners, an oil, and styling products, so there's more than one way to bring K18 into a routine.

Using the K18 hair mask

The K18 Leave-In Molecular Repair Mask is designed to be used after washing and towel-drying hair to damp, not dripping wet. Apply one to two pumps root to tip depending on hair length and damage level, wait at least four minutes without rinsing, then style as usual. It suits any hair type, though the amount of product needed will vary with hair length and how compromised the strands are. A smaller 15ml size is available if you'd rather try it before committing to the full-size mask.

K18 shampoo and everyday haircare

Beyond the mask, K18's shampoo range covers different needs. The K18 Peptide Detox Shampoo is a weekly clarifying wash for oily scalps and product build-up, while the K18 Damage Shield pH Protective Shampoo and matching conditioner are designed for daily use on damaged or colour-treated hair. For blonde or lightened hair, the K18 TripleBright Shampoo helps manage brassiness, and the K18 Airwash Dry Shampoo extends time between washes when you need a refresh without water.

Styling and treatment extras

The range also includes the K18 Molecular Repair Hair Oil for shine and frizz control, the K18 HeatBounce Conditioning Heat Protectant for use before hot tools, and the K18 AstroLift Volume Spray for fine or flat hair that needs lift at the root. K18 products are vegan and cruelty-free, made without sulphates or parabens, and formulated to work well alongside colour treatments rather than stripping them out. Adore Beauty is an authorised retailer of the full K18 range.