Which U.S. regulatory body certifies applied edible waxes as safe to eat?

U.S. Food and Drug Administration (FDA)

The safety and edibility of the waxes applied to apples after harvest are subject to strict oversight by specific governmental agencies. The U.S. Food and Drug Administration (FDA) is the body responsible for certifying that the ingredients used in these post-harvest coatings are food-grade and safe for human consumption. These waxes, which are chemically designed to be indigestible and pass through the digestive tract essentially unaltered, must meet FDA standards before being used. While the Environmental Protection Agency (EPA) monitors pesticide residues to ensure treated produce is safe, the direct approval and regulation of the coating substance itself falls under the purview of the FDA.