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K18 Leave In Molecular Repair Hair Mask Biomimetic Hairscience 50 ml / 1.7 oz

BetterUp
(489)
Registered as a private seller
Consumer protection regulations resulting from EU consumer law are therefore not applicable. eBay buyer protection still applies to most purchases.
US $19.99
Approximately£14.90
(US $19.99 / fl oz)
or Best Offer
Condition:
New
More than 10 available2,318 sold
Breathe easy. Free postage and returns.
This one's trending. 2318 have already sold.
Collection:
Free collection in person from Acworth, Georgia, United States
Postage:
Free USPS Ground Advantage®.
Located in: Acworth, Georgia, United States
Delivery:
Estimated between Wed, 23 Jul and Mon, 28 Jul to 94104
Delivery time is estimated using our proprietary method which is based on the buyer's proximity to the item location, the delivery service selected, the seller's delivery history and other factors. Delivery times may vary, especially during peak periods.
Returns:
30 days return. Seller pays for return postage.
Payments:
    Diners Club

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eBay item number:395273663437
Last updated on 15 Jul, 2025 19:53:42 BSTView all revisionsView all revisions

Item specifics

Condition
New: A brand-new, unused, unopened and undamaged item in original retail packaging (where packaging ...
Expiration Date
Fresh 12 Months After Opening
Period After Opening (PAO)
12M
Size
1.7oz
Ingredients
Hydrolyzed Wheat Protein
Suitable For
Hair
Active Ingredients
Hydrolyzed Wheat Protein, Hydrolyzed Wheat Starch
Formulation
Cream
Model
K18
Features
A leave-in treatment mask that works on the molecular level to re
Scent
Non Perfumed
Country/Region of Manufacture
United States
Product Line
K18
UPC
0858511001128

About this product

Product Identifiers

Brand
K18
MPN
K18-31005
UPC
0858511001128
eBay Product ID (ePID)
22046890875

Product Key Features

Department
Women
Hair Type
Damaged Hair
Type
Hair Mask
Styling Effect
Hair Repair

Dimensions

Volume
1.7 fl oz

Item description from the seller

About this seller

BetterUp

98.7% positive Feedback3.6K items sold

Joined Aug 2023
Registered as a private sellerThereby, consumer rights stemming from EU consumer protection law do not apply. eBay buyer protection still applies to most purchases.

Detailed seller ratings

Average for the last 12 months
Accurate description
4.9
Reasonable postage cost
5.0
Delivery time
5.0
Communication
5.0

Seller Feedback (460)

All ratings
Positive
Neutral
Negative
  • c***r (949)- Feedback left by buyer.
    Past month
    Verified purchase
    I absolutely love this product. The quality of it is great! Using very little of K-18 really does work!
  • t***e (41)- Feedback left by buyer.
    Past 6 months
    Verified purchase
    This is leave-in conditioner is very expensive for what you get, but left my hair feeling healthier than before treatment.
  • n***j (407)- Feedback left by buyer.
    Past 6 months
    Verified purchase
    I guess i would give it 5 stars, but i have only used it once so far. I have naturally curly hair so i really only need to wash my hair once a week. I will have to wait longer to see if it works even better.
See all Feedback

Product ratings and reviews

4.7
126 product ratings
  • 109 users rated this 5 out of 5 stars
  • 4 users rated this 4 out of 5 stars
  • 6 users rated this 3 out of 5 stars
  • 3 users rated this 2 out of 5 stars
  • 4 users rated this 1 out of 5 stars

Would recommend

Good value

Good quality

Most relevant reviews

  • Most favourable review

    Great product, but doesn't work for everyone

    I bought this for both myself and the hubby who has long hair, but his gets frizzy on the ends. While it works beautifully for me, it really didn't make much of a diff for his hair. This is after 4 or 5 days in a row he used it. Maybe worth a try though. Can't hurt. But I would start out with the small size. It doesn't take much, so it is plenty enough to find out if you want to buy more

    Verified purchase: YesCondition: NewSold by: sweetdream_0

  • Most critical review

    Not bad, but not good.

    I don't think this is a bad product, but I don't think it's a great one either. It tends to be a bit sticky while I'm blow-drying my hair. I thought it was a conditioning mask, but I feel like it's more of a smoothing styling aid, although to keep the immediate smooth results you still have to use a styling product too. I'm in Texas and we have very high humidity so it's not easy creating a lasting style and keeping frizz at bay. Perhaps I would have liked this better if I was in another climate, but I can't really tell what its purpose is.

    Verified purchase: YesCondition: NewSold by: slykloss

  • k18 for hair is wonderful!

    Great product for chemically treated hair. This product leaves my hair so soft and healthy. I appreciate the fast shipping and well packaged. I highly recommend this product. Thank you very much! Oh, this is my second order and will continue to order again.

    Verified purchase: YesCondition: NewSold by: anthony0608

  • Best hair product ever

    I can’t get a brush or comb through my hair without this leave in hair mask! I have tried so many different products & always end up giving them away! My hair is very long & tangles easily. A little goes a long way. This is a good price! Less expensive than the company that makes it!

    Verified purchase: YesCondition: NewSold by: beastofallbeauty

  • Amazing!

    Best product I have used in a long time, and it gets better after you put it in after one wash. Also, my naturally-curly hair doesn’t frizz anymore — it actually goes into beach waves now!

    Verified purchase: YesCondition: NewSold by: yamamoto00