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K18 Leave-In Molecular Repair Hair Mask Treatment
Returns & Exchanges
RETURN & EXCHANGE POLICY
You have 10 calendar days to return an item for EXCHANGE ONLY from the date you received it. As the purchaser you would be responsible for return shipping charges.
Final sale items are not eligible for exchange or store credit. Final Sale items include Litres, Litre Duos, Clearance, Last Chance, Hot Tools, Hair Accessories, Brushes, Combs, Nail Polishes, Nail Accessories, Hair Extensions, and Appliances.
To be eligible for a exchange:
- your item(s) must be either be unused or no more than a quarter of the volume missing.
- your item(s) must be in the original packaging.
- your item(s) need to have the receipt or proof of purchase.
STEP 1 - Complete the online return form in full. Incomplete forms will not be accepted: Click here to download a return form
STEP 2 - Ship your item(s) back to us. You are responsible for return shipping charges. Shipping costs are non-refundable.
STEP 3 - We will immediately notify you on the status of your exchange after inspecting your returned item(s)
STEP 4 - You can exchange your item(s) or receive an online shop credit in the form of an e-gift card
In the event that you cannot find a suitable exchange a merchandise credit for the same value of the product purchased will be issued to you in the form of a store credit. Store credits cannot be redeemed for cash or refunded. You will receive your e-gift card within 5 business days after the exchange is confirmed
RETURNING TO A ZENNKAI SALON LOCATION
Should you prefer to return your online purchases to a location near you, come visit us! Simply bring your items and proof of purchase to our salons, following our set out Exchange Policy.
Final sale items are not eligible for exchange or store credit. Final Sale items include Litres, Litre Duos, Clearance, Last Chance, Hot Tools, Hair Accessories, Brushes, Combs, Nail Polishes, Nail Accessories, Hair Extensions, and Appliances.
If you are not fully satisfied with your purchase we will EXCHANGE it within 10 days with proof of purchase. EXCHANGE OR STORE CREDIT ONLY, NO CASH REFUNDS.
Hair Tools & Appliances
Zennkai provides a 1 year warranty on electrical tools with a manufacturer defect. They can be exchanged within one year of original purchase date, with proof of purchase and in its original packaging/box.
All electrical tools may be returned for exchange only due to manufacturer defect, with proof of purchase and all original components. No exchanges will be given without proof of purchase. Items must be in the original box/packaging. In the event that you cannot find a suitable exchange a merchandise credit for the same value of the product purchased will be issued to you in the form of a store credit.
Hot Tools & Appliances are a FINAL SALE unless manufacturer defect and are not eligible for exchange or store credit.
Shipping
You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are nonrefundable.
Contact Us
If you have any questions on how to return your item to us, contact us via email at zennkai@megahairfamily.com.
Corporate Office
310-5491 REGENT ST
BURNABY BC V5C 4H4
Email: zennkai@megahairfamily.com
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K18's leave-in mask is built around sh-Oligopeptide-78 (K18PEPTIDE™), a biotech-developed peptide designed to reconnect broken polypeptide chains and disulfide bonds within the hair's keratin structure — damage typically caused by bleach, color, chemical services, or heat styling.
Unlike surface-level deep conditioners, the formula is designed to work at the hair's innermost structural layer rather than just coating the cuticle, which is why K18 markets it as effective across all hair types and textures, including coily and curly hair. The mask is pH-optimized (5.0–6.0) to help minimize cuticle swelling, and its cream format is designed for detangling and softening on application.
This is a leave-in treatment — it's formulated to be applied after shampooing (skip conditioner beforehand, since it can block the peptide's penetration) and left in rather than rinsed out.
What It Is
K18 Leave-In Molecular Repair Hair Mask — the patented leave-in treatment that reverses damage in 4 minutes. Powered by biomimetic K18PEPTIDE™ (sh-Oligopeptide-78) that reconnects broken polypeptide chains and disulfide bonds at the innermost layer of hair. Works on damage from bleach, color, chemical services, and heat.
Hair Concerns
- Color Safe
- Damage, Split Ends, Breakage
- Frizz
Key Benefits
- K18PEPTIDE™ cares for hair damage from bleach, color, chemical services, and heat in as few as four minutes
- Protects hair from damaging UV rays, environmental aggressors, and mechanical styling for up to three days
- Restores strength, softness, smoothness, shine, and bounce — biotech-powered K18PEPTIDE™ restored damaged hair by up to 82% (clinical study on 8x bleached hair, after 2 uses)
Highlighted Ingredients
What Else You Need to Know
Apply once or twice per week as the treatment-day step in the K18 routine. Light floral fragrance with jasmine + peony notes. Clean formula — free of parabens, sulfates, phthalates, and mineral oils.
Fragrance
Jasmine + peony.
How to Use
Shampoo, do not condition. Towel-dry. Apply 1-3 pumps starting at ends. Leave 4 minutes. Do not rinse. Style as usual.
FAQ
Do I rinse out K18 Leave-In Molecular Repair Hair Mask?
No, it's a leave-in treatment. Apply after shampooing, let sit for 4 minutes, then style without rinsing.
Should I use conditioner before K18?
K18 recommends skipping conditioner beforehand, since it can leave a film that blocks the peptide from penetrating effectively.
Is K18 safe for all hair types?
Yes, K18 is formulated to work at the hair's innermost structural layer, making it suitable for all hair types and textures, including coily and curly hair.
Authorized K18 retailer · Zennkai Canada since 1984 · Patented K18PEPTIDE™ biotech repair · Biomimetic damage care in 4 minutes · Born in the salon, science-backed since 2020