Final answer:
The FDA is the federal agency that requires ingredient disclosure of cosmetic preparations to employees. It enforces laws on cosmetics for purity, effectiveness, and truthful labeling, including safety warnings if not tested.
Step-by-step explanation:
The federal agency responsible for ensuring that the ingredients of cosmetic preparations be available to employees is the Food and Drug Administration (FDA). The FDA enforces laws to ensure the purity, effectiveness, and truthful labeling of products including cosmetics. Although the FDA does not generally require pre-market approval for cosmetics, it does require that all color additives be specifically FDA approved before being included in cosmetic products sold in the U.S., and mandates labeling regulations including warnings if products have not been safety tested. As such, companies in the cosmetics industry are tasked with the responsibility of providing ingredient information to their employees to comply with FDA regulations.