I find the SPF arms race disconcerting, especially considering the new chemicals companies crank out to accomplish these 85+SPF mutants. Just so everyone knows, the FDA barely regulates cosmetics and topicals like sunscreen. The FDA uses a "blacklist" to prevent companies from using dangerous chemicals. That means any manufacture can use any new experimental chemical in a cosmetic (as long as it isn't on the blacklist) and consumers and the FDA bear the burden of proving hazard, which is nearly impossible with trace exposure to chemicals anyway. Its a regulatory strategy that encourages innovation at the expense of safety. I work in the medical device industry, and many of us in the biz use as few commercial cosmetics/topicals as possible.
On top of that, SPF (Sun Protection Factor) is a unit of measurement indicating the amount of UV radiation required to cause sunburn on skin with the sunscreen on, relative to the amount required without the sunscreen (Wikipedia). So, wearing a sunscreen with SPF 50, your skin will not burn until it has been exposed to 50 times the amount of solar energy that would normally cause it to burn.
Most human beings living normal human lives do not need more than SPF 15, applied properly and reapplied when necessary. The blocking agents in SPF 15 are typically oxides and are much safer than the mystery chemistry in SPF50 cream.
On top of that, SPF (Sun Protection Factor) is a unit of measurement indicating the amount of UV radiation required to cause sunburn on skin with the sunscreen on, relative to the amount required without the sunscreen (Wikipedia). So, wearing a sunscreen with SPF 50, your skin will not burn until it has been exposed to 50 times the amount of solar energy that would normally cause it to burn.
Most human beings living normal human lives do not need more than SPF 15, applied properly and reapplied when necessary. The blocking agents in SPF 15 are typically oxides and are much safer than the mystery chemistry in SPF50 cream.







