At this point, you’re likely well-versed in the fact that sunscreen is a must in your daily beauty routine. But how are you applying your go-to formula? Are you simply wearing a foundation that promises SPF protection? Or are you mixing sunscreen directly into your foundation like you’re conducting a science experiment? As concerned beauty editors who want to help you keep your skin in top-notch shape, we’re here to help you make good skincare choices, starting with sunscreen. So to find out the best way to apply SPF under makeup, we reached out to Dr. Lian Mack, a board-certified dermatologist based in New York City. Hit *Pause* Before Mixing SPF Into Your Foundation“I don’t recommend mixing moisturizer with SPF,” says Dr. Mack. “Mixing the two may alter the properties of the SPF, making it less effective.” And before we go any further, no, wearing a foundation with SPF by itself won’t provide sufficient sun protection because you probably won’t apply enough of the product to get the level of protection you need (more on that below). Instead, Dr. Mack recommends layering the two products, starting with your sunscreen.