Products are split into three levels based on ingredient labels

GO
Best choice
SLOW
Contains ingredients with possible health concerns
STOP
Contains harmful ingredients
STOP

K18 BIOMIMETIC HAIRSCIENCE

Leave-In Molecular Repair Hair Mask

Last verified: March 9, 2026

  • Water (Aqua) (Eau)
  • Alcohol Denat.
  • Propylene Glycol
  • Cetearyl Alcohol
  • Dicaprylyl Ether
  • Cetyl Esters
  • Behentrimonium Chloride
  • Polysorbate 20
  • sh-Oligopeptide-78 (K18Peptide)
  • Hydrolyzed Wheat Protein
  • Hydrolyzed Wheat Starch
  • Isopropyl Alcohol
  • Tocopherol
  • Phenoxyethanol
  • Potassium Sorbate
  • Citric Acid
  • Fragrance (Parfum)
  • Geraniol
  • Linalool
  • Hexyl Cinnamal
  • Benzyl Alcohol

Why This Product is Rated STOP

Leave-In Molecular Repair Hair Mask by K18 BIOMIMETIC HAIRSCIENCE has been evaluated by Million Marker and contains ingredients with known health concerns. This product is rated STOP, indicating higher concern.

We recommend avoiding STOP-rated products and seeking safer alternatives from our GO or SLOW categories.

Learn more about how Million Marker scores products →

Frequently Asked Questions