Are we full of parabens?!? Apparently so. In a study published in the Journal of Applied Toxicology (March 2012), it was found that 99% of breast cancer tissues sampled contained parabens, such as methyl paraben, propyl paraben, isobutyl paraben, ethyl paraben, butyl paraben and E216. These chemicals are commonly used in shampoos, deodorant and antiperspirants,