As you wash your hair or put on your makeup, the last thing you are likely worried about is whether your favourite shampoo or foundation is going to cause cancer.

But, guess what? New studies show that a whopping 99 percent of all breast cancer cells contain parabens—chemicals known, without a doubt, to be linked to cancer. (1)

The most common of these chemicals are methylparaben, propylparaben, ethylparaben, and butylparaben, all of which are used as preservatives in such things as your hair-care products (shampoos, conditioners, gels etc.), makeup, moisturizers (both face and body), as well as most shaving creams and gels. (2)

In the many studies that now link parabens to breast cancer, what is noteworthy is that most of the chemicals are actually found in the breast tissue closest to the underarm (the axilla quadrant) of the breast, which is also where cancerous tumors are typically found. It is no coincidence this area is also where you typically apply deodorant and antiperspirants.