Our Take
A leave-in conditioning spray powered by K18's resilicore™ technology — inspired by resilin, a natural protein that can withstand extreme temperatures. Unlike conventional heat protectants that only coat the cuticle surface, resilicore™ penetrates into the cortex where heat damage actually originates, providing protection up to 232°C and 85% less breakage after blow-drying. Contains K18PEPTIDE™ alongside sunflower, rosemary, and rice bran extracts. Contains a small amount of Isopropyl Alcohol near the end of the ingredient list — placing it in cgm_modified territory for strict CGM followers, though the curl community broadly accepts it for diffusing. Apply to damp hair before blow-drying or diffusing; re-apply to dry hair before hot tools.
Who is this for?
Our assessment — not the brand's claim
Curl Pattern
Porosity
Free From
Ingredients at a Glance
Water
Universal solvent and primary base of most hair products.
Cellulose Gum
Carboxymethyl cellulose (CMC) — a cellulose-derived thickener. One of the most commonly us…
Propanediol
Plant-derived solvent and humectant that helps other ingredients penetrate.
K18PEPTIDE
Arginine
A conditionally essential amino acid that strengthens the hair shaft by contributing to ke…
Free From
Want to know more about an ingredient? Browse the ingredient glossary →
How to Use
Apply throughout sectioned, damp hair and brush through for even distribution. Use before blow-drying or diffusing. Re-apply to dry hair before straighteners or curling irons — no wait needed before applying heat. For best results when diffusing, apply after the K18 mask and before styling products.
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Where to Buy
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K18 Hair UK
Details
- Type
- Heat Protectant
- Line
- Peptide Prep
- Price tier
- premium
- Routine step
- Style
Reviews
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