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A sunblock that is SPF 30 blocks 98% of UV and SPF 50 blocks 99% of UV or only 1% more. People mistakenly believe they can be out twice as long with SPF 50 or higher rated lotions and this is not the case. The FDA will no longer allow companies to label sunblock as higher than SPF 50.
Some sunblocks show on the tube as blocking UV A but actually failed the FDA tests. Others include the ingredient Retinol or Vitamin A but this has been shown to promote skin cancer so not something you want to rub on.
I had a skin cancer removed a couple of years ago that was on my forehead. The women in the waiting room for the surgeon had for the most part bandages on their noses as this was what got the most sun. With the men it was always the tops of the ears - probably the result of wearing baseball caps.
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