The concept of hyaluronic acid in hair-care products isn’t a new one. According to cosmetic chemist David Petrillo, when it shows up in shampoos and conditioners, hyaluronic acid binds to the strands and follicles encourage a smoother look and feel and help prevent breakage. But using a straight-up hyaluronic acid serum intended for the skin seems a little strange, no? Not to mention potentially wasteful if it’s not effective. But that didn’t stop one TikTok user from experimenting and sharing her results with what has become an audience of hundreds of thousands of viewers.
On August 29, Kaitlyn Boyer posted