Endocrine disruptors (EDs) are xenobiotics able to alter endocrine system homeostasis causing adverse health effects in an intact organism, or its progeny, or (sub)populations. Humans are frequently exposed to one or to a mixture of ED by inhalation, ingestion, and/or dermal contact of several products. Some suspected ED in cosmetics are under the EU lens, because they could increase the source of endocrine disruption in humans. EDs can be included in a cosmetic product as active principles, as a contaminant or as a by-product leached form packaging.
The ED mode of action does not fit to classical linear toxicology trend but shows non-linear trend and it can occurs at several levels of hormone homeostasis: firstly, influencing hormone’s binding to its specific receptor, but also by modifying hormone regulation, synthesis, secretion, transport and degradation. The uniqueness of EDs among all categories of xenobiotic substances imply a brand new strategy for assessing their effect on products used daily by humans. A case by case strategy for assessing safety of ED in cosmetics suggested by Prof. Vera Rogiers (SCCS Co-chair) is in line with ED action. In this scenario, some tests should be mandatory and included in the safety evaluation of all ED compounds in cosmetics.
The possible presence of ED in cosmetics opens a new branch of studies on human exposure, usually not included in classical toxicology, but more related to endocrinology. Therefore, a new role for experts in this field should be considered when evaluating safety of ED in cosmetics.