No hate to Angie – I love her videos – but pH isn’t a reliable test for whether a vitamin C serum works.
And part of the reason why this misconception has been all over the internet for the last 20 years is that the researchers REALLY didn’t summarise their own research accurately. Never take the abstract at face value!
Kind of Stephen (cosmetic chemist) also wrote about the limitations of the paper here: https://www.kindofstephen.com/skin-penetration-of-ascorbic-acid/
🙋🏻 I’m Michelle, a chemistry PhD, cosmetic chemist and science educator, 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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