Jumping right into the scary stuff . . . here's just a little bit of information of the evil those nasty toxins do to your body. 

"Parabens possess estrogen-mimicking properties that are associated with an increased risk of breast cancer. These chemicals are absorbed through the skin and have been identified in biopsy samples from breast tumors."

Along with parabens, formaldehyde, SLS/SLES, phthalates, and sunscreen chemicals are also linked to various types of cancer and toluene is strongly linked to immune system toxicity.

Also, when it comes to synthetic colors (you can identify these by their initials and abbreviations, i.e. D&C Red 27 or FD&C blue 1), it's considered a human carcinogen and is banned in Europe because, as it's derived from petroleum and coal tar sources. Also, scary? It's linked to ADHD in children. 

Here's a video of former VS Angel Miranda Kerr's mom in a pretty amazing and eye-opening video about their line of certified organic products, called Kora Organics


Here are some links you may want to check out for some more scientific reasons and rationales behind the importance of being nitpick about the products on your vanity.