Purito Sunscreen and All About SPF Testing | Lab Muffin Beauty Science

Purito Centella Unscented Sunscreen tested at SPF 19, 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: coming soon
In vivo Purito test results from INCI Decoder: https://incidecoder.com/purito-controversy
Consumer tests
US: https://www.reddit.com/r/SkincareAddiction/comments/gpvdss/sun_care_consumer_reports_2020_sunscreen_ratings/
Australia: https://www.choice.com.au/health-and-body/beauty-and-personal-care/skin-care-and-cosmetics/articles/sunscreen-test
New Zealand: https://www.consumer.org.nz/articles/5-more-sunscreens-fail-to-meet-spf-claims
Hong Kong: https://www.consumer.org.hk/ws_en/news/press/528/sunscreen-test.html
Hong Kong: https://sg.news.yahoo.com/industry-backlash-against-hong-kong-055209520.html
AMA Labs fraud case: https://www.justice.gov/usao-sdny/pr/owner-ama-rockland-based-consumer-products-testing-company-arrested-fraud-scheme
In vitro and in vivo correlation study: https://doi.org/10.1111/ics.12377
In vitro testing challenges: https://cosmeticsandtoiletries.texterity.com/cosmeticsandtoiletries/april_2020/MobilePagedReplica.action?pm=2&folio=DM11#pg59
Cosmetics Europe in vitro method ring testing: https://onlinelibrary.wiley.com/doi/abs/10.1111/ics.12459
John Staton (Dermatest) talk on ISO 24444 Changes: https://youtu.be/pj2MgjjnXxY
Development trends in China: https://www.basf.com/tw/en/media/BASF-Information/Quality-of-life/sunscreen-development-trends.html
More about sunscreen formulations from a cosmetic chemist: https://realizebeauty.wordpress.com/2015/08/09/an-honest-mistake-when-zinc-based-sunscreens-go-wrong/
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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: coming soon

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Видео Purito Sunscreen and All About SPF Testing | Lab Muffin Beauty Science канала Lab Muffin Beauty Science