Substantiating claims

Substantiating claims: How much improvement can be expected from actives?

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In the monthly Q&A, Susan asked, I have a number of age / liver spots on my hands and face, as I was part of the “let’s use baby oil to get a suntan” generation. I am hoping that you could tell me the best actives to tone these little beauties down. I am specifically...

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Substantiating claims: What does it mean to “brighten skin” or “reduce the appearance” of something? Looking at parameters, measuring, and testing (long post)

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Oh wow, did I go down the rabbit hole for a question posed by Susan on the monthly Q&A quite a few months back. As with many of the awesome questions you ask there, this one took a while because it’s become a series that might end up being an e-book as well. Thank you for...

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