This $7 hyaluronic acid serum makes my skin feel like water

“Hyaluronic acid is a sugar molecule that occurs naturally in the skin, [and] it helps to bind water to collagen, trapping it in the skin, so that skin can appear plumper, dewier, and more hydrated,” Tsippora Shainhouse, a dermatologist in Santa Monica, California, told Allure. She added, “Natural hyaluronic acid is bound to collagen on ...