Why sunscreens fail SPF tests: All about SPF testing

Purito Centella Unscented Sunscreen tested at SPF 19 (edit: now also at 28.4), lower than its SPF 50+ label, in 2 in vivo tests. Why do scientists insist on in vivo SPF tests? Should we stop trusting all Korean sunscreens? All Asian sunscreens? Should we only use sunscreens from large Western manufacturers? I go through it all in this video.

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In this video:
🧴 How is SPF tested?
🧴 SPF from the ingredient list? Number of filters? Concentrations of filters?
🧴 In vitro testing?
🧴 UV cameras?
🧴 In vivo testing?
🧴 Are Asian sunscreens dodgy?
🧴 What the hell do I do with this information?

Blog post with more info: https://labmuffin.com/purito-sunscree...
In vivo Purito test results from INCI Decoder: https://incidecoder.com/purito-contro...
Consumer tests
US:   / sun_care_consumer_reports_2020_sunscreen_r...  
Australia: https://www.choice.com.au/health-and-...
New Zealand: https://www.consumer.org.nz/articles/...
Hong Kong: https://www.consumer.org.hk/ws_en/new...
Hong Kong: https://sg.news.yahoo.com/industry-ba...
AMA Labs fraud case: https://www.justice.gov/usao-sdny/pr/...
In vitro and in vivo correlation study: https://doi.org/10.1111/ics.12377
In vitro testing challenges: https://cosmeticsandtoiletries.texter...
Cosmetics Europe in vitro method ring testing: https://onlinelibrary.wiley.com/doi/a...
John Staton (Dermatest) talk on ISO 24444 Changes:    • "Changes to ISO Sunscreen Standards", John...  
Development trends in China: https://www.basf.com/tw/en/media/BASF...
More about sunscreen formulations from a cosmetic chemist: https://realizebeauty.wordpress.com/2...
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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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