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?

A. Great question. It seems everything contains a bit of sunscreen
these days, whether it’s our mineral makeup or our lip balm (which is
so important). With all of the layering, something has to give you
protection if not double your protection, right? Unfortunately this is
not the case. I consulted with Connecticut based dermatologist Dr. Loyd
Godwin who indicated that you do not increase SPF by layering two
different products. You should always use a sunscreen of at least 15
that provides both UVA and UVB protection.
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