Responding to skeptics who discount as alarmist all concerns about the hormonal effects of synthetic chemicals, the authors of Our Stolen Future point out that “manufacturers frequently withhold information about the ingredients in their products using the claim of proprietary information or trade secrets.” As a result, “it is anybody’s guess how many of the plastic consumer goods on the market contain hormone-disrupting chemicals. The information in the scientific literature about the biological activity of and human exposure to chemicals of concern is equally fragmentary and unsatisfactory.

Fitzgerald, Randall. The Hundred-Year Lie: How to Protect Yourself from the Chemicals That Are Destroying Your Health (p. 161). Plume. Kindle Edition.