Chinese Association of Idaho State University (CAISU)
How can I protect my skin from the sun naturally?
Anything that prevents UV rays from penetrating your skin cells is technically a sunscreen. ... By covering yourself with mud, dirt or other light-blocking, opaque substances, you will be shielding your skin from much of the sun's rays.
http://www.myhealthtipstoyou.com/8-natural-ways-to-protect-your-skin/
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