![]() There are a lot of really annoying things about this test. A special UV lamp is shone onto the backs, and how much UV the skin can take with and without the sunscreen is compared. SPF tests are done by putting 2 milligrams per square centimetre of sunscreen on the backs of human volunteers. In short, SPF measures how much protection you get from erythemal or sunburn-causing UV from a sunscreen, or any other product. Related post: What Does SPF Mean? The Science of Sunscreen Let’s start with how SPF testing is done. The video is here on YouTube, keep scrolling for the written version… Hopefully this will give you more insight into the whole situation and why SPF testing is so darn tricky. So were we all wrong to say the labeled SPF was the best data point we had? Should we stop trusting all Korean sunscreens, or Asian sunscreens? Should we only use sunscreens from large Western manufacturers? Why did cosmetic formulators and scientists who understand sunscreen wait till there were two in vivo SPF tests before saying anything? ![]() Purito put out a statement saying they’ve paused the sale of their sunscreens, and they said that they actually sent off their sunscreens for a test earlier but they still haven’t gotten the results yet. But I think most people now feel like there is enough evidence to be more cautious. There is the possibility of the newer test being wrong and the label being correct, and I’ll go into some of the possible reasons for this later on. This sort of thing has happened with all sorts of sunscreens from all over the world before, from both big and small brands – where later testing didn’t get the SPF that’s claimed on the label. There were rumours that it didn’t match the label claim before, but until INCI Decoder published the two in-vivo SPF tests on their blog, a lot of scientists were saying that there wasn’t enough evidence yet to disbelieve the label. ![]() ![]() Recently you might have heard that one of my former favorite sunscreens Purito Centella Unscented Sun tested at SPF 19, which is much lower than its labeled protection of SPF 50+. ![]()
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