Parabans (Methylparaban, Propylparaban, Ethylparaban, Butylparaban, Isobutyl Paraban) These are synthetic preservatives used in most personal care products.  Parabans have been found to have hormone-disrupting qualities, such as the ability to mimic estrogen.  Currently, this is of major concern to researchers since parabans have been found in breast cancer tissue.  Parabans penetrate the skin and appear in the blood.

Parabens are derived from petroleum; absorbed through the skin; may irritate skin; may be toxic if swallowed; potential mutagen; endocrine disrupter; may impair fertility.  They have not been adequately tested and are not recommended for children; CIR is re-evaluating safety, previously considered safe as used.