Anhydrous means “without water.” In skincare, that translates to super-concentrated oils, butters, waxes, and active ingredients that pack a punch. Because there’s no water, these formulas are stable, potent, and preservative-light — but using them correctly makes all the difference. Read further to learn more about how they work, how to care for them, and a few insider tips to make them shine. Plus, a little reader discount awaits at the end.