K18 Biomimetic Hairscience HeatBounce™ Leave-In Conditioner Heat Protectant
by K18 · hair_care
Editor's Take
K18's patented peptide leads the formula, backed by bio-based thermal shields and a silicone-free formula; the fragrance stack and allergens keep it from clean perfection.
Four-pillar formula scores
- Efficacy: 8.5 / 10
- Modern Tech: 9.2 / 10
- Clean Beauty: 6.8 / 10
- Sustainability: 7.5 / 10
The Verdict
This is a rare heat protectant that actually repairs while it shields. The K18Peptide sits high in the INCI, supported by Hemisqualane and quaternized barley protein to form a modern, silicone-free thermal defense system. The biomimetic formula is genuinely advanced, though the undisclosed fragrance and eight allergens disqualify it from strict clean certification. Worth it if you want structural treatment with your heat styling, not just cosmetic slip.
Full INCI list
Water (Aqua) (Eau), Cellulose Gum, Isopentyldiol, Propanediol, Cetearyl Alcohol, Isopropyl Palmitate, Sodium Benzoate, C13-15 Alkane, sh-Oligopeptide-78 s-Fruit Fly Oligopeptide-1, (sh-Oligopeptide-78 s-Fruit Fly Oligopeptide-1) Peptides, Laurdimonium Hydroxypropyl Hydrolyzed Barley Protein, Helianthus Annus (Sunflower) Seed Oil, Oryza Sativa (Rice) Bran Extract, Helianthus Annuus (Sunflower) Extract, Rosmarinus Officinalis (Rosemary) Leaf Extract, Tocopherol, Behentrimonium Chloride, Brassicatrimonium Chloride, Gluconolactone, Arginine, Coco-Glucoside, Lactic Acid, Cellulose, C12-20 Alkyl Glucoside, Citric Acid, Potassium Sorbate, Benzyl Alcohol, Isopropyl Alcohol, C14-22 Alcohols, Fragrance (Parfum), Amyl Salicylate, Benzyl Salicylate, Citronellol, Citrus Aurantium Peel Oil, Dimethyl Phenethyl Acetate, Geraniol, Geranyl Acetate, Isoeugenyl Acetate, Limonene, Linalool, Linalyl Acetate, Pinene, Tetramethyl Acetyloctahydronaphthalenes, Vanillin.