It started with a harmless quest for perfect wash-and-go hair. Every girl wants it, and Siobhan O'Connor and Alexandra Spunt finally found it in a fancy salon treatment. They were thrilled--until they discovered that the magic ingredient was formaldehyde.

Shocked, O'Connor and Spunt left no bottle unturned. If it went on their body (and thus, was absorbed into their skin and bloodstream), they researched it. As it turns out, many of those unpronounceable ingredients in your self-tanner and leave-in conditioner are not regulated and the "natural" on your face wash doesn't mean what you think...