Great question — answering as the UphillTech team:
I assume when you say sunscreen you mean sunscreen lotion, as in putting on your skin. According to Wikipedia , the ingredients that actually block the UV radiation in sunscreen lotion are titanium dioxide and zinc oxide , and these metallic powders are mixed with a heavy oil to make a lotion that doesn't wash (or sweat) off easily. Commercial lotions may also have some other organic chemicals that also block UV, but not to the same extent that titanium and zinc powder do. Although the type of oil you mix into a home made recipe version is up to you, you will probably need to buy one or both titanium dioxide powder or zinc oxide powder to use if you plan on mixing your own. The only health...
Full answer by Mark Ripley: https://lifehacks.stackexchange.com/a/13949 (CC BY-SA 3.0).
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