K18 Leave-In Molecular Repair Hair Mask Review | SkinSourcer
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The Shelf · Hair · The Healthy Hair Edit

K18 Leave-In Molecular Repair Hair Mask
No. 01 in Edit 031

K18 Leave-In Molecular Repair Hair Mask

Treatments USA Approx. $75

The peptide is the whole product and it is the only one of its kind at this price. Four minutes on damp hair, no rinse, and you are done.

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Why we like the Leave-In Molecular Repair Hair Mask

  • The shortest treatment step in this edit
  • Genuinely changes how damaged hair handles
  • Fifty millilitres goes further than it looks
Texture
Light cream that disappears into damp hair
Key ingredients
sh- Oligopeptide-78 · Cetearyl Alcohol · Propylene Glycol · Behentrimonium Chloride
Fragrance
Scented. Parfum plus declared geraniol, hexyl cinnamal and linalool.
Best for
Bleached or chemically treated hair · Hair that has stopped holding a style
Works on
Breakage · Elasticity loss · Chemical damage
Made in
USA
Where to buy
Amazon
Price
$75, approximate
Listing checked
2026-08-13

Our verdict on the K18 Leave-In Molecular Repair Hair Mask

Worth it on damaged hair. Pointless on hair that is not damaged. Note that alcohol denat. sits second in the list.

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Where the Leave-In Molecular Repair Hair Mask sits on The Shelf

The Healthy Hair Edit Edit 031 · THE HAIR EDIT The Healthy Hair Edit Which treatments work inside the hair, which only smooth the outside, and why the difference is worth knowing before you spend seventy-five dollars.

The rest of The Healthy Hair Edit

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Reviewed 2026-08-12. K18 Leave-In Molecular Repair Hair Mask appears in The Healthy Hair Edit. Every product on The Shelf is listed in the product index.