The science of using topical creams to protect our skin from harmful sunrays is still relatively new. So, you may experience conflicting information from different quarters of the scientific community. FDA has tried to address consumer confusion concerning sunscreens by requiring manufacturers to tag their products with an SPF and UVB. EWG found that only 25% of 800 tested sunscreens are effective at protecting your skin without the use of potentially harmful ingredients. Use broad-spectrum sunscreens, which protect the skin from rays that cause sunburns. Choose products with an SPF range between 15 and 50. Avoid sunscreen formulations that uses retinyl palminate. The spray-on sunscreens are more convenient but less effective than rubbing a cream sunscreen onto the skin. The EWG specializes in providing practical resources, like the 2012 Sunscreen Guide, to consumers while simultaneously pushing for national policy change.

http://eartheasy.com/blog/2012/05/4-tips-for-safe-effective-sunscreen-use

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