K18 sale on Amazon

Subscribe & Save on K18 (4)

The one-time price, and what Amazon takes off when you subscribe instead. Amazon lets you cancel a subscription at any time, so it works on a single order too.

• Leave-In Molecular Repair Hair Mask

  Up to 5% off with Subscribe & Save

  $75Buy on Amazon

• AirWash Non Aerosol Dry Shampoo Spray

  Up to 5% off with Subscribe & Save

  $48Buy on Amazon

• HeatBounce Conditioning Heat Protectant Spray

  Up to 5% off with Subscribe & Save

  $48Buy on Amazon

• AstroLift Reparative Volume Spray

  Up to 5% off with Subscribe & Save

  $46Buy on Amazon

Amazon's next sales

• Prime Big Deal Days 2026: Oct 6–7. Source: About Amazon.
• Black Friday 2026: Nov 27–30. Source: About Amazon, the 2025 dates.

Every beauty sale date: Amazon, Sephora and Ulta

Cheaper every day: K18 dupes

1. 
   

   COSRX Peptide 132 Ultra Perfect Hair Bonding Treatment

   for K18 Leave-In Molecular Repair Hair Mask

   $13.32 $23vs $75−93% per oz

   $3.28 / fl oz against $44.36 / fl oz.

   #19 in Deep Hair Conditioners on Amazon

   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, color and heat damage.

   What it 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.

   Buy the dupeFull comparison

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