SPF Doesn’t Mean What You Think It Means

Science
SPF seems pretty simple. Find a high number, rub some on your nose, and you’re ready for some sunshine. Unfortunately the science behind it is a little more complicated.

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Sources:

https://www.researchgate.net/profile/Giulio_Pirotta/publication/283515177_An_overview_of_sunscreen_regulations_in_the_world/links/563cdb7508aec6f17dd7e0d6/An-overview-of-sunscreen-regulations-in-the-world.pdf?origin=publication_detail
https://onlinelibrary.wiley.com/doi/full/10.1111/ics.12226
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3514825/
https://www.skincancer.org/prevention/seal-of-recommendation/testing

The Difference Between UVA, UVB, and UVC Rays


https://www.who.int/uv/faq/whatisuv/en/index2.html
https://onlinelibrary.wiley.com/doi/abs/10.1034/j.1600-0781.2003.00007.x
https://www.sciencedirect.com/science/article/pii/S1027811714000494#bib13
https://pubs.rsc.org/en/Content/ArticleLanding/2013/PP/C2PP25127B#!divAbstract

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