Which part of the FDA is related to vitamins and amino acids?

The correct answer pertains to Part D, which addresses dietary supplements, including vitamins and amino acids. The FDA has specific regulations for these substances under this part, outlining definitions, labeling requirements, and safety standards. This regulatory framework is essential, as it helps ensure that consumers have access to safe and effectively labeled dietary supplements.

Part D emphasizes the importance of good manufacturing practices, allowing consumers to trust that the vitamins and amino acids they purchase meet certain safety and quality standards. It also facilitates the FDA's oversight capabilities to monitor and address any issues related to these products if they arise. Thus, selecting the correct part reflects an understanding of how the FDA manages dietary supplements and ensures public health safety regarding vitamins and amino acids.