Scientific Safety Information on Progesterone (California Proposition 65) - Scientific Safety Information on Progesterone
California Proposition 65 (Prop 65)
and Progesterone Cream Warnings
Amy Kosowski, M.S., LDN
Prop 65: What is it?
Proposition 65, the Safe Drinking Water and Toxic Enforcement Act of 1986 , was enacted as a ballot initiative in the state of California in November of 1986. The Proposition was intended by its authors to protect California citizens and the State's drinking water sources from chemicals known to cause cancer, birth defects or other reproductive harm, and to inform citizens about exposures to such chemicals 1.
Proposition 65 requires the Governor to publish, at least annually, a list of chemicals “known to the state to cause cancer or reproductive toxicity .” Progesterone, as well as other human hormones, appear on this list 1. Set forth below is the information that formed the bases for the addition of progesterone to the Prop 65 list by the California Office of Environmental Health Hazard Assessment (“OEHHA”).
Prop 65 and Progesterone - Perspective
In August of 2004, OEHHA published a document stating the rationale for the addition of Progesterone to the Prop 65 list 2. This document is a review of human, animal, and in vitro studies that used progesterone, synthetic progestins, and other progestagens (progesterone-like compounds). Experimental data from the use of all of these compounds were mixed together, along with data from studies using other steroid hormone derivatives (mainly synthetic estrogens) and many different methods of administration.
Although this review covered the existing scientific literature on progesterone and its many derivative compounds, there are many problems with the type of data analysis that was employed.
First, progesterone is endogenous to humans and necessary for bone and reproductive health while progestins and other synthetic progestagens are not. Progestins and progestagens are similar in molecular structure to progestero ...
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