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@laura.lavigne reviewing K18 Hair Mask at 05:52 in a YouTube Shorts videoLeave-In Molecular Repair Hair Mask"If you color treat your hair or especially if you bleach your hair, I would 10 out of 10 recommend definitely recommend having some sort of bond repair ingredient in your hair care routine."$75.00

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Leave-In Molecular Repair Hair Mask
4.9Leave-In Molecular Repair Hair Mask
Laura LavigneLaura Lavigne2.4K subscribers
4.9Leave-In Molecular Repair Hair Mask
  • “I hate that this is one of those products that I saw almost an immediate difference with. It's so expensive”5:06–5:11
  • “I hate repurchasing this because it's a small little bottle”5:14–5:18
  • “I think that really helped to not have the bleach dry out my hair as much”5:37–5:43
  • “Where I noticed the biggest difference from this is in these front pieces in my hair”6:02–6:06
  • “You only need a tiny amount of this. I do two pumps”6:18–6:25
  • “I used to use way too much of this at a time and I didn't like how it felt. Um, so after a couple times of using it and not really seeing the hype, I tried it again with less product and was like, 'Okay, I get the hype now.'”6:25–6:30
  • Source: Hair growth routine that finally worked for me - Dec 13, 2025
TristinTristin381 subscribers
4.9Leave-In Molecular Repair Hair Mask
Jodi MannesJodi Mannes142K subscribers
4.9Leave-In Molecular Repair Hair Mask
MakeupByCherylMakeupByCheryl190K subscribers
4.9Leave-In Molecular Repair Hair Mask
Sincerely Miss AshSincerely Miss Ash194K subscribers
4.9Variant: Leave-inLeave-In Molecular Repair Hair Mask
  • “A couple times a month I will use the K18 after shampooing. This is called the leave-in molecular repair hair mask”4:49–4:57
  • “It's an extremely expensive tiny little product”5:00–5:05
  • “I've been using this for years, so I'm in the maintenance stage of this”5:03–5:06
  • “This is the one product that I think really saved my hair from all the bleach damage I had”5:10–5:16
  • “If you have a lot of damage from bleach and your hair just feels really like dry and scraggly at the ends, I would try this product if you have not yet because it really does make a difference”5:14–5:20
  • “It probably took me Gosh, I don't even know. A few months maybe of using it consistently to notice a difference, but my hair has been on the up and up since I started using this”5:24–5:32
  • “This will probably forever stay in my routine”5:08–5:12
  • Source: How I keep my fine hair long and healthy - Jun 6, 2026
TristinTristin381 subscribers
4.8Leave-In Molecular Repair Hair Mask
  • “Oh my god this is such a big buy why? Because like I was mentioning that my hair was facing breakage and this really helps strengthen the bonds of your hair”
  • “It really makes a world of the difference in making your hair more manageable making it frizz free and kind of strengthening it”
  • “This is the kind of product that your hair can get addicted to”
  • “I have like today only in fact bought another one of this because it really makes a difference especially when you styling your hair often this really helps keep it going strong”
  • “I prefer this much more than the Olaplex bond repair”
  • Source: 2025 product empties: buy or bye? - Dec 13, 2025
Aashi AdaniAashi Adani299K subscribers
4.5Leave-In Molecular Repair Hair Mask
Dr. Sam EllisDr. Sam Ellis835K subscribers
4.5Leave-In Molecular Repair Hair Mask
  • “This mask has patented technology that no other hair product has”0:13–0:18
  • “I truly, truly think this is unlike any other hair products out there”0:26–0:29
  • “Notice a lot less breakage and damage”0:29–0:31
  • “I've actually emptied so many of these”0:31–0:33
  • “Shampoo, rinse my shampoo. You don't have to do conditioner. Put this on, leave it for four minutes, and then you're done”0:33–0:35
AlxandraAlxandra224K subscribers
4Leave-In Molecular Repair Hair Mask
  • “I think this might be my third one that I've finished and I think this is such an incredible product”11:44–11:51
  • “It really does help the like strength and overall quality of your hair”11:51–11:59
  • “When I had blonde hair this saved my hair. It made my hair so much more moisturized and way less brittle”11:57–12:06
  • “A little goes a long way, so this lasts quite a while”12:13–12:18
  • “This is spendy, but I feel like the price per use isn't quite worth it because it's still quite expensive, but it's better than it could be, I guess”12:15–12:23
  • “I think it did a really good job at really keeping my hair healthy when I needed that desperately”12:32–12:36
  • “This is something I would recommend”12:40–12:44
  • “I don't know if I would repurchase... I do think that this has a punchier result than the Living Proof one”12:43–12:47
  • Source: Beauty and skincare empties with repurchase thoughts - May 7, 2026
Rainier CramerRainier Cramer19K subscribers
Brand note

K18 is a science-backed hair repair brand built around a patented peptide that works at the molecular level to rebuild damaged bonds — and the consensus from creators is that it genuinely delivers where other bond repair treatments don't. The Leave-In Molecular Repair Hair Mask is the clear anchor here, with multiple creators calling it the reason their bleached or heat-styled hair can grow long and stay healthy. The trade-off is real: it's expensive, and some note that while a little goes a long way, the price per use still stings.

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