Homemade Sunscreen: What the Recipes Claim vs What the Labs Measured
Type “homemade sunscreen” into Google and the autocomplete finishes the sentence for you: recipe, with zinc oxide, for face. Most recipes come with a number attached, SPF 20 here, SPF 30 there. What is harder to find is anyone who made one and put it under a lab instrument. A few research groups have, and…