1. A I've been obsessed with for years because one dropper-full makes my skin dewy and baaaaby-soft, even in the dead of winter! Hyaluronic acid is one of my fave skincare ingredients EVER due to its ability to retain water 💦 According to , a quarter-teaspoon of hyaluronic acid holds about one and a half gallons of water — and this serum does not disappoint!

Grace & Stella hyaluronic acid serum