Sunscreen Math: Can You Add Up SPF?
If you use a moisturiser with SPF 20, a sunscreen with SPF 30, and a foundation with SPF 15, what SPF do you get? 30 + 20 + 15 = 30. Confused much? SPF math isn’t like regular math. Here’s why: Does Layering Sunscreens Increase Sun Protection? Layering sunscreens will NOT give you added SPF […]