K18 Leave-In Molecular Repair Hair Mask
- Leave-in mask, wait 4 minutes and do not rinse
- 1 to 3 pumps from ends to roots
- Repairs bleach, color, chemical and heat damage in 4 minutes
- 0.51 fluid ounces, jar, 15 ml size mentioned
- Cruelty free, fresh scent
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A no-rinse repair mask for chemically treated hair, applied after shampooing in place of conditioner. The size entry is small and the volume field in the listing is garbled, so check the amount.
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ASIN: B09HR5KSR8Category: Hair Masks
Overview
K18 sells this mask as a leave-in peptide treatment that repairs bleach, color, chemical and heat damage. It is a cream in a jar for adults with chemically treated hair, with a fresh scent.
The reason to buy is a short, no-rinse routine aimed at damaged hair, with clear steps on the label text. The limitation is the size listing, which shows a very small amount, and the repair claim is marked with a footnote that is not shown.
Who it's for
A person with damaged, bleached or colored hair who is willing to follow a precise shampoo, towel dry, apply and wait routine. Those who want a rinse-out mask with a long soak, or need a large amount, should look at other options.
Pros and cons
- Clear step-by-step usage text
- No rinse needed
- Targets bleach, color and heat damage
- Very small size entry
- Volume field in the listing is unreliable
- Repair claim footnote not shown
Performance notes
The routine is to shampoo, skip conditioner, towel dry thoroughly, work a few pumps from the ends toward the roots and wait before styling, without rinsing. The listing says less is more, so overuse can weigh hair down. Results are tied to the peptide treatment named in the product benefits.
Specifications
| Brand | K18 |
|---|---|
| Dimensions & fit | |
| Size | 0.51 Fl Oz (Pack of 1)lower than 97% of 35 hair masks |
| Item weight | 0.05 kg |
| Item dimensions | 1.37 x 1.37 x 3.18 inches |
| Capacity & performance | |
| Age Range Description | Adult |
| Liquid Volume | 15 cubic_meters |
| Construction & materials | |
| Material Features | Cruelty Free |
| Included components | |
| Package Type Name | Jar |
| Other details | |
| Hair Type | Chemically Treated |
| Scent Name | Fresh |
| Hair Conditioner Type | Hair Conditioning Mask |
| Item Form | Cream |
| Recommended Uses For Product | Shampoo, skip conditioner. Towel-dry thoroughly. Apply 1-3 pumps from ends to roots (3-9 pumps for 15ml sized mask). Less is more. Wait 4 minutes, do not rinse. |
Closest rivals on specs
Briogeo Superfoods Avocado + Kiwi Hair Mask- Size 0.5 vs 2 fl oz (-75%)
Keratin Complex KCTEXTURE Intense Hydrating Masque- Item Weight 0.11 vs 0.26 pounds (-58%)
- Size 0.5 vs 1.3 fl oz (-62%)
Biolage Strength Recovery Deep Treatment- Item Weight 0.11 vs 0.21 pounds (-48%)
- Size 0.5 vs 3.3 fl oz (-85%)
Frequently asked questions
How do I use K18 Leave-In Molecular Repair Hair Mask?
Shampoo, skip conditioner and towel dry thoroughly. Apply 1 to 3 pumps from ends to roots, or 3 to 9 pumps for the 15 ml mask. Wait 4 minutes and do not rinse.
Does K18 Leave-In Molecular Repair Hair Mask replace conditioner?
The directions say to skip conditioner after shampooing, then apply the mask and leave it in.
Is K18 Leave-In Molecular Repair Hair Mask cruelty free?
Yes. Cruelty free is listed in the material features.
Is K18 a rinse-out mask?
No. The directions say to leave it in and not rinse.