I've had a lot of questions about what I think of some sunscreen products with unusual claims - in this video I talk about whether Colorescience's powder sunscreen gives SPF 50, and whether you can really just apply a pea-sized amount of Skinnies sunscreen.
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Blog post with more info here: labmuffin.com/...
Colorescience FDA submission data:
SPF/amount applied relationship: doi.org/10.111...
Skin topology and sunscreen: doi.org/10.115...
More info about choosing sunscreens (in the free sample of my eBook): labmuffin.com/...
Erratum: I messed up a little in explaining the methodology for calculating the weighted average for the Colorescience powder - they used the minimum for the lowest time bracket, then the midpoint for the others, so their estimate was less conservative than what I described.
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Lab Muffin Beauty Science is a channel by me, Michelle - I'm a chemistry PhD and beauty lover, here to explain how beauty products work, debunk myths, and help you make smarter decisions about your skincare, hair and makeup!
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Blog post for this video with more info: labmuffin.com/...
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