3 Reasons Not to Mix Sunscreen With Moisturizer

You dilute the SPF Mixing sunscreen with moisturizer or foundation reduces the concentration of active ingredients. You won’t get the labeled protection — likely SPF 15 instead of 30.

You won’t apply enough Sunscreen is tested at a specific thickness. Blending means you spread the same amount over more surface area, so you’d need to apply much more of the mixture to get full protection.

Layering works better Apply sunscreen first, let it dry, then add moisturizer or foundation on top. If you want a combined product, buy a moisturizer with SPF built in — but even then, most people don’t apply enough.