Hailey Bieber Is a Fan of This Viral Hair Mask, and It’s on Sale at Sephora RN

Hailey Bieber Is a Fan of This Viral Hair Mask, and It’s on Sale at Sephora RN

Hailey Beiber

@haileybeiber Instagram

Let’s be real: Few things in life feel as incredible as a great hair day. I’m talking about the kind where you can’t resist checking out your own reflection in storefront windows as you walk down the street. And that’s why I’m a strong believer that when it comes to hair products, only the best will suffice—even if it requires a bit of a splurge. 

According to countless TikTok videos attesting to its hair-transforming effects, rave reviews from picky Byrdie editors, and the support of Hailey Bieber, K18 definitely ranks among the best newer brands in the space. In fact, Bieber was one of K18’s earliest fans, telling Refinery29 in 2021, “My favorite hair product right now is this product called K18.” She was referring to the now-iconic K18 Leave-In Molecular Repair Hair Mask, which was the brand’s first product. A bond repair treatment, the Bieber-approved mask pioneered the brand’s ethos of tackling damaged hair on a deeper level. 

K18 Leave-In Molecular Repair Hair Mask

Sephora K18 Biomimetic Hairscience Leave-In Molecular Repair Hair Mask


Buy Now $75 $60

Not only is K18’s signature bond-building treatment beloved by Bieber, but it’s also a viral social media sensation with more than 20 billion views on TikTok, according to the brand. The leave-in mask repairs damage with the help of a patented peptide that mimics the natural structure of your hair. In other words, when a strand of your hair breaks, so do the polypeptide chains that make it up, but when you use the Molecular Repair Hair Mask, the K18peptide essentially fills in those gaps. Whether the effects of bleach, color treatment, heat styling, or all of the above have taken a toll on your strands, this celebrated strengthening mask will leave them feeling unbelievably soft and smooth. Plus, it has a subtly satisfying fresh floral scent.

Since Bieber shouted out the brand a few years ago, K18 has expanded its line of science-backed hair products to include shampoos, a conditioner, a hair oil, and more. If you’ve seen the gushing TikToks and have wanted to try out the products for yourself, now is the perfect time—K18’s entire haircare line is on sale as part of Sephora’s 2024 Spring Savings Event. Now through April 15, Sephora Beauty Insider members can shop the entire site at discounted prices, with savings starting at 10% and increasing up to 20% depending on membership status. Keep scrolling to find more of the best K18 products to shop during Sephora’s beauty sale. 

K18 Haircare Deals at Sephora:

K18 AirWash Dry Shampoo

Sephora K18 Biomimetic Hairscience AirWash™ Dry Shampoo


Buy Now $48 $38

K18 entered the dry shampoo game with the launch of AirWash in March—and it’s already generating plenty of buzz on social media. In her review of the new product, one Byrdie editor described it as “a total innovation in the dry shampoo category.” Unlike aerosol or powder dry shampoos, AirWash is a liquid mist that absorbs oil and eliminates odor without leaving behind a powdery, starchy feel or a white cast. As with all of K18’s formulas, the scent is subtle and clean.  

K18 Peptide Prep Clarifying Detox Shampoo

Sephora K18 Biomimetic Hairscience PEPTIDE PREP™ Clarifying Detox Shampoo


Buy Now $38 $30

If you don’t already use a clarifying shampoo, consider this your sign to add one to your routine. K18’s take on the category is essentially a detox for your scalp, deeply cleansing it of dirt, oil, and excess product buildup without stripping away essential moisture. The best part? It’s safe for color-treated strands and suitable for a wide range of hair types and textures.    

K18 Damage Shield pH Protective Shampoo

Sephora K18 Biomimetic Hairscience DAMAGE SHIELD pH Protective Shampoo


Buy Now $36 $29

It may sound scientific (that’s kind of K18’s thing), but all you really need to know about the pH-optimized formula of this shampoo is that it helps prevent damage during the washing process. It addresses common hair frustrations like tangles, split ends, and breakage while promoting a healthier scalp. Like the Peptide Prep Shampoo, it has a clean citrus scent.

K18 Damage Shield Protective Conditioner

Sephora K18 Biomimetic Hairscience DAMAGE SHIELD Protective Conditioner


Buy Now $36 $29

Round out your pH-balancing routine with the Damage Shield Protective Conditioner, which offers the same detangling, damage-fighting benefits as the corresponding shampoo. The nourishing formula also helps to preserve color, boost shine, and protect against damage caused by environmental factors like UV rays.

K18 Molecular Repair Hair Oil

Sephora K18 Biomimetic Hairscience Molecular Repair Hair Oil


Buy Now $65 $52

Level up your slicked-back bun game with this strengthening hair oil. In addition to targeting split ends and breakage, the Molecular Repair Hair Oil enhances shine and moisture. And don’t be deterred if you have fine hair: Sephora customers agree that this product feels practically weightless, with one of many five-star reviewers commenting, “Doesn’t weigh the hair down and most definitely made my bleached ends look great!”

With so much positive feedback from customers, K18 is definitely one of those beauty brands worth the splurge—but it’s even better when you can stock up on the tried-and-true haircare essentials at a discounted price.  


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