With the ever-increasing SPF numbers available these days in sunblocks you'd assume that the higher the SPF the better the protection, right? Unfortunately, the SPF is only part of the story. It turns out that a sunblock with an SPF of 15 blocks 93% of UVB rays (the ones that cause burns) while a block with an SPF of 30 blocks 97% of the rays.

But what about blocking UVA rays, the ones that cause aging (both UVA and UVB can lead to skin cancer)? It turns out that the SPF level gives no idea of how well the lotion will block this component of the sun. To ensure that your sunblock will protect against both the UVA and UVB rays look for a broad spectrum lotion with some of the following compounds: