Final answer:
The Food and Drug Administration (FDA) requires information about ingredients of cosmetic preparations to be available to employees.
Step-by-step explanation:
The agency that requires information about ingredients of cosmetic preparations to be available to employees is the Food and Drug Administration (FDA).
The FDA regulates cosmetics under the Federal Food, Drug, and Cosmetic Act (FD&C Act). Under this act, cosmetics are defined as products intended to be applied to the human body for cleansing, beautifying, promoting attractiveness, or altering the appearance without affecting the body's structure or functions.
The FDA requires cosmetics manufacturers to ensure the safety of their products and to have information about the ingredients readily available to their employees.