Sunscreen is generally considered the best defense against skin cancer. What you may not know is that many sunscreens on the market are potentially more dangerous than actual exposure to the sun.
Risk 1 - INSUFFICIENT PROTECTION
A study published in the Journal of Investigative Dermatology states "Sunscreens are widely advocated to protect against skin cancer but if they offer insufficient protection... they may inadvertently increase skin cancer risk."
SPF refers to how much longer you can be in the sun before you burn. If you usually burn after 30 minutes without sunscreen, then SPF 10 means you can be in the sun for ten times longer (10 x 30 = 300 minutes) which would be 5 hrs. SPF ratings refer only to protection from UVB radiation (sun burning rays) not UVA radiation (dangerous killer rays).
In order to be protected from UVA radiation, which is the primary cause of skin cancer, your sunscreen must contain one of the following ingredients:
- titanium dioxide
- zinc oxide
- avobenzone (also called butyl methoxydibenzyl methane)
- Mexoryl SX
- Tinosorb (not available in U.S. products)
If one of these is not listed as a PRIMARY or ACTIVE ingredient, the sunscreen does not offer adequate protection.
Risk 2: DANGEROUS INGREDIENTS
Oxybenzone, a common active ingredient in US sunscreens, is a hormone disrupter (it mimics estrogen). It's not just the synthetic, chemical ingredients in sunscreens that are dangerous. Vitamin A is added to 41% of all sunscreens. Vitamin A sounds like a good thing, right?
Recently available data from an FDA study indicates that:
Vitamin A, when applied to the skin in the presence of sunlight, may speed the development of skin tumors and lesions. (May also be listed as retinal palmitate.)
For more information:
Environmental Working Group's 2010 Sunscreen Guide
Sunscreens Exposed
How Does Your Sunscreen Rate?
Best Beach and Sport Sunscreens
And my personal favorite: Hall of Shame
UPDATE: See Comment #9 (my daughter Jaime) for more important sunscreen facts
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