Why sunscreens fail SPF tests: All about SPF testing

Video Description

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. Subscribe for videos every fortnight: http://bit.ly/labmuffinyt 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-sunscreen-and-all-about-spf-testing-with-video/ 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/ Powered By Chemicals Mugs: https://labmuffin.com/shop/ ----ABOUT---- 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! ----FOLLOW---- Blog https://labmuffin.com Instagram https://instagram.com/labmuffinbeautyscience Facebook https://facebook.com/labmuffin Twitter https://twitter.com/labmuffin ------------------------------------- Want smooth, glowing skin? Grab a copy of my FREE Essential Guide to Exfoliation! https://labmuffin.com/exfol ------------------------------------- ----RELATED POSTS AND VIDEOS---- Free exfoliation guide https://labmuffin.com/free-guide What Is SPF? Is High SPF Sunscreen Better? https://youtu.be/5ISHlw7j3t0 How much sunscreen do you need? https://youtu.be/NKS5kMbZBlk Why DIY Sunscreen Doesn't Work: https://youtu.be/aTNcbLHZusc Do you need sunscreen indoors? https://youtu.be/BUIWZcwflx4 Busting More SPF Myths: https:///youtu.be/ADvwMA8E0jQ SPF Crash Course: https:///youtu.be/9FiPFAMlgmY Blog post for this video with more info: https://labmuffin.com/purito-sunscreen-and-all-about-spf-testing-with-video/ ----SKINCARE GUIDE---- The Lab Muffin Guide to Basic Skincare is here! Find out more: https://labmuffin.com/skin