http://beauty.about.com/od/sunscree1/tp/sunscreenstop.htm

http://www.webmd.com/content/article/133/118761.htm

Wait! I have some information! Look!

There’s no one brand that’s the best – but you do want one with a UVA-blocking ingredient as well as a UVB-blocker. UVB ones are easy to come by – they’re in every sunscreen – it’s the UVA ones that are more difficult to find.

Look at the ingredients list – there are only THREE tried-and-true UVA blockers (no matter what the label says).

Avobenzone (aka Parsol 1789)
Titanium dioxide
Zinc oxide

Avobenzone is a chemical block – it absorbs the sun’s rays and basically neutralizes the effect chemically. The bad part about Avobenzone is that it does degenerate over a period of a few hours, so you need to reapply fairly frequently.

Titanium dioxide and zinc oxide are physical blocks – they reflect the sun’s rays, so they don’t ever hit your skin. Unfortunately, if you have darker skin and are using a product in which the particles of titanium/zinc have not been micronized properly, these products can leave a whitish cast on your skin.

The best thing to do to find a good-quality ZO or TD sunscreen is to check labels and expect to pay about $10-$12 for a tube. It may seem expensive but isn’t your skin worth it?

[If you live in Canada or Europe there is a newer sunscreen ingredient available called Meroxyl – it’s VERY effective at blocking UVA and UVB rays when blended with Avobenzone in a product – L’Oreal’s Ombrelle line has this combination and it’s great.

http://thebestsunscreen.blogspot.com/

I hope this information helps!