Simone Biles Hails This Repairing Mask as a Game-Changer for Hair Health

If you click on links we provide, we may receive compensation.

All eyes are on Simone Biles this 2024 Paris Olympics, and rightfully so. The decorated gymnast knows how to grab attention with her jaw-dropping floor routines, vault performance, and more that have garnered her eight olympic and 30 world championship medals. While I’m dying to know all of her secrets, I at least have the deets on her favorite hair care products. Biles, an ambassador of K18, revealed that she uses the brand’s Leave-In Molecular Hair Mask, as well as its hair oil version that she calls “game-changers.”

Thanks to these products, she says her hair “stays healthy amid all the stress I put it through, including with extensions.” She’s not the only one who swears by this revitalizing formula—other celebrities like Hailey Bieber, Selena Gomez, and Rihanna have been known to use it, too.

The K18 Leave-In Molecular Hair Mask promises to noticeably repair hair damage from color, heat, and chemical use in four minutes thanks to its peptide-filled formula, which penetrates to the innermost layer of hair to mend broken bonds, thereby restoring strength and elasticity.

Marisa Garshick, M.D., a board-certified dermatologist at MDCS Dermatology explained in a previous Shape interview that peptides are composed of amino acids that fortify the scalp hairs. “Since peptides stimulate collagen production, this can improve the overall health of the hair, including the strength and thickness, as collagen helps to support the hair follicle and natural proteins in the hair,” Dr. Garshick adds. “Additionally, when applied topically, peptides may also help hydrate the scalp and hairs, making them appear healthier.'

As a result, this leave-in formula leaves your strands soft, smooth, more resilient, as well as adds bounce upon applying it at the ends toward the roots. Just make sure to use it post-shampooing to damp hair and skip conditioner beforehand—you can still add styling products afterwards.

Nearly 13,000 Amazon shoppers give the K18 Leave-In Molecular Hair Mask a five-star rating. “After towel drying and waiting four magic minutes, I had frizz-free soft, manageable hair for the first time in forever,” said a reviewer, who added that it gives their “limp, fine overworked hair” a “root lift [...] and flowing hair.” Another user raved that it “restores your locks to their former glory” as it makes tresses feel “unbelievably soft, smooth, and rejuvenated.”

Some customers even found it effective for hair growth. “After just four uses, my hair has never been this long and healthy,” said a fan. Others shared that they see “lots of new growth,” it feels “naturally thicker” in an instant, and that the product is a “growth miracle.”

If it’s good enough for one of the greatest gymnasts in history, it’s certainly worth checking out in my book. Shop the K18 Leave-In Molecular Hair Mask for $29 as well as more restorative hair treatments, below.