Excellent product. I have used K18 for 5 consecutive shampoos so far. I have long (past my shoulders), wavy, heavily highlighted hair. My hair feels more managable, less frizzy and healthy :) I highly recommend.

So good I ordered another bottle for my daughter after my first use. We both say it’s magic! It’s expensive, but I don’t think I can live without it now. My hair feels so incredibly soft and just looks healthier.

I was hesitant that this product was not going to be authentic. I still had a small amount from a bottle I had purchased from Sephora. I put a pump on each hand and compared the consistency, smell, and the writing on each bottle. I was very happy to see that they are the exact same but there is much more product here than in the smaller bottle. The price here is amazing!!

I have a bottle of the real k18 from sephora. I can tell immediately that 5oz bottle from Sams club isn't a real version of K18. Additional red flags, other than consistency of the actual product, I examined the back and you can see a difference in the manufacturing address. Another thing, the picture on Sams website shows the bottle coming with an outer box, but when it arrived, it had no outer box. On the back of the bottle it says "this product is meant to be sold with an outer box, if this product does not have an outer box, do NOT buy it".... i think it's best to pay the extra money and purchase this from an authorized retailer.

My hair is highlighted and during the summer gets so dry. I’ve tried a lot of hair masks. My daughter works at popular makeup, skincare, hair store. Nothing helped, until I tried K18. I have very thick hair, I’m told enough for three heads. The bummer is it is very soft to me. But it’s not a noticeable difference visually. I still recommend.

I have used this twice now as directed: After shampooing apply to ends first then work it up through midshaft and to the roots (do not apply regular conditioner) . Let it sit for 4 minutes before styling. I've tried every other conditioner under the sun, spending LOTS of money for no results. I almost gave up and cut off my hair. But I'm so glad I found Sam's carry the K18 mask as it truly does work! My hair hasn't looked this good for years! I section my hair into three, then use 1 pump per section. This bottle will last a long time.

Ive used Olaplex and other hair repair products. I've had k 18 applied at the salon. This has an alcohol smell and made my hair dry frizzy and burnt looking. I am really upset how this product ruined my hair. After a hour my scalp started to itch. Returning item asap. The .99 cent conditioner makes my hair feel better than this. Not sure if this is a knock off product or real but it didnt work for me.

I originally purchased a much smaller bottle elsewhere as a trial, I was beyond impressed right from the first use. After seeing K18 at Sam's club for much much less that other places, I immediately purchased it! K18 is a bit pricy, but it is indeed worth every penny!

Miracle in a bottle, I’ve been dying my hair for over 30 years and this stuff does not disappoint!

Great product and best price!