sunscreen

Ask Mickey: When It Comes To SPF, Does 20 + 20 = 40?

Q. I've always wondered, if my foundation is 20 SPF and my moisturizer is 20 SPF, does that add up to 40 SPF? Or is it still just 20 SPF? Basically, what I mean is, if you are layering different products that contain SPF, do you increase the protection?

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