Health, Longevity & Biohacking
Expert Reveals Most People Apply Sunscreen at One Fifth Effective Dose
ZOE Science & Nutrition
Most replayed moment: How to Balance Sunlight and Suncream | Professor John McGrath
"One of the big problems we have, those SPF numbers were calculated in the laboratory by putting a certain amount of sunscreen onto a square centimeter of skin. But actually none of us, myself included, ever put sunscreen on as thickly as it was done in those laboratory calculations. We actually just dab and smear, don't we really?"
McGrath disclosed that SPF ratings are calculated using laboratory conditions with far thicker application than real-world use, meaning advertised protection levels are not achieved by consumers. He recommended 6 teaspoons or a shot glass worth for full body coverage and reapplication every 2-3 hours.
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ZOE Science & Nutrition