The most common parabens are methyl-, isobutyl-, propyl-, ethyl-, butyl-, and isopropyl-. This class of preservatives is widely used to prevent the growth of bacteria, mold, and yeast. Parabens are most worrying for their 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. Certain parabens have also been linked to hormone disruption