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Did you see the Choice sunscreen testing results? Here’s an SPF deep dive! Key points: • Sunscreens are very effective, these results do not indicate that you should lose faith in them • SPF testing is a lot less precise than it might seem - this is an inherent limitation of the test, there’s a lot of variation with results even if nothing has gone “wrong” • Formulas can change over time (slight changes in raw ingredients etc) • I’d guess a lot of “fails” are explained by interlab variability (t
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