K18
Leave-In Molecular Repair Hair Mask
A leave-in hair treatment that uses a patented biomimetic peptide (K18PEPTIDE™, sh-Oligopeptide-78) to reconnect broken polypeptide chains inside the hair cortex. Applied to clean, towel-dried hair for 4 minutes without rinsing. Designed to reverse damage from chemical services, heat, and mechanical stress. Contains Hydrolyzed Wheat Protein and Hydrolyzed Wheat Starch alongside conditioning agents Behentrimonium Chloride and Cetyl Esters. Fragrance complex includes three EU-regulated allergens: Geraniol, Hexyl Cinnamal, and Benzyl Alcohol.
Ingredient Snapshot
14 beneficial ingredients detected with no known safety concerns.
7 ingredients to watch: Behentrimonium Chloride, Rubbing Alcohol (IPA), Fragrance, Geraniol, Linalool, Hexyl Cinnamaldehyde, Benzyl Alcohol may cause sensitivity in some skin types.
AI-generated analysis for general information only. It may be incomplete or inaccurate and is not medical advice. Always read the product label and check with a professional about allergies, pregnancy, or any health concern.
Ingredient Details
CautionBehentrimonium Chloride
AI analysis
A long-chain quaternary ammonium salt (quat) derived from rapeseed oil, used as a hair conditioning agent. It adsorbs onto the negatively charged surface of hair fibers, reducing static, detangling, and improving combability. Considered one of the milder quats in cosmetic use.
Benefits
- ✓Significantly reduces tangling and improves combability of hair
- ✓Smooths the hair cuticle, adding shine and softness
- ✓Reduces static electricity that causes frizz and flyaways
- ✓Milder and less irritating than shorter-chain quaternary ammonium salts
Potential concerns
- !Can cause contact sensitization in susceptible individuals with repeated exposure
- !Leave-on application increases scalp exposure compared to rinse-off conditioners
CautionIsopropyl Alcohol(Rubbing Alcohol (IPA))
AI analysis
A short-chain volatile alcohol used as a solvent and carrier in cosmetics. It evaporates quickly, contributing to the fast-drying, lightweight finish of leave-in hair treatments. At the concentrations used in cosmetics it functions primarily as a carrier solvent, but can be drying with repeated leave-on use.
Benefits
- ✓Evaporates quickly, leaving no residue and giving the product its lightweight, non-greasy feel
- ✓Effective solvent that helps deliver active ingredients including the K18PEPTIDE™
- ✓Aids preservation by creating an unfavorable environment for microbial growth
Potential concerns
- !Can be drying and irritating to the scalp with repeated leave-on exposure
- !Disrupts the scalp barrier at higher concentrations; not recommended for dry or sensitive scalps
- !More irritating than long-chain fatty alcohols
CautionParfum(Fragrance)
AI analysis
Benefits
- ✓Provides pleasant scent to products
Potential concerns
- !Can contain hundreds of undisclosed chemicals
- !Common cause of allergic contact dermatitis
- !Potential sensitiser — CTPA recommends allergen disclosure
Backup sources
CTPA Fragrance Allergen Disclosure Guidelines: EU Regulation 1223/2009 requires that 26 identified fragrance allergens be listed individually on product labels when present above 0.001% in leave-on products and 0.01% in rinse-off products. Parfum/fragrance is the leading cause of cosmetic-related contact allergy.
CautionGeraniol
AI analysis
A naturally occurring monoterpenoid alcohol found in rose, geranium, citronella, and many other essential oils. Used as a fragrance ingredient for its sweet, floral, rose-like scent. It is one of the EU-regulated fragrance allergens.
Benefits
- ✓Provides a fresh, sweet, rose-like floral fragrance note
- ✓Naturally occurring in a wide range of plant essential oils
Potential concerns
- !EU-regulated fragrance allergen requiring mandatory labeling at >0.001% in leave-on cosmetics
- !Contact sensitizer — one of the more commonly implicated fragrances in allergic contact dermatitis
- !Individuals with fragrance sensitivity or rose oil allergy should exercise caution
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