K18
Leave-In Molecular Repair Hair Mask dupes
Leave-In Molecular Repair Hair Mask costs about $75 for 50 ml ($44.36 / fl oz). The closest match below is COSRX Peptide 132 Ultra Perfect Hair Bonding Treatment at $19, about 89% less per ounce. Each pair is compared on format, finish and key ingredients, including what the dupe doesn't do.
Leave-in treatment used on damp hair after shampooing, with no rinse and no conditioner for the first few uses. Works in about 4 minutes.
- $75
- $19
- 89%
The dupe, side by side
-89%
Cost per fl oz
K18$44.36 / fl oz
COSRX$4.68 / fl oz
- Size
- 50 ml
- 120 ml
- Key ingredients
- K18Peptide™
- Tripeptide-132 HCl, Biotin, Soluble collagen, Hydrolyzed hyaluronic acid
What matches
Both rebuild broken keratin bonds with a low-molecular-weight peptide — K18Peptide in one, Tripeptide-132 in the other — and both are aimed at bleach, colour and heat damage.
What the dupe does worse
This one is rinsed out after a few minutes instead of left in, and it is silicone-and-oil heavy, so fine hair can be left with a slight film K18 never leaves.
Questions
What is the best dupe for K18 Leave-In Molecular Repair Hair Mask?
COSRX Peptide 132 Ultra Perfect Hair Bonding Treatment at about $19. Both rebuild broken keratin bonds with a low-molecular-weight peptide — K18Peptide in one, Tripeptide-132 in the other — and both are aimed at bleach, colour and heat damage. This one is rinsed out after a few minutes instead of left in, and it is silicone-and-oil heavy, so fine hair can be left with a slight film K18 never leaves. About a tenth of the price per ounce.
How much do you save?
Leave-In Molecular Repair Hair Mask costs about $75 for 50 ml, or $44.36 / fl oz. COSRX Peptide 132 Ultra Perfect Hair Bonding Treatment works out at $4.68 / fl oz, roughly 89% less.
Is a dupe the same as the original?
No. A dupe matches the format, finish or key ingredients closely enough that most people won't see a difference in wear. Packaging, scent, shade range and longevity usually differ, and each comparison on this page says how.
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