Zinc Oxide

Zinc oxide is a mineral that sits on your skin and does a few things at once. It absorbs UV rays, which is why you'll find it in mineral sunscreens. It also acts as a physical barrier, so it can help protect skin from irritants. Because it's opaque and thick, it's often used as a bulking agent in formulas to give them body and texture. You might notice it leaves a white cast, especially in higher concentrations. Some people find it soothing for irritated or reactive skin, though that's more about the barrier function than any active treatment. It's been used in skincare for decades and works well for people who prefer mineral sun protection or need something gentle.