What does the US FDA regulate concerning drug products?

The US FDA regulates the official labeling of all prescription and over-the-counter drugs to ensure that consumers receive accurate and comprehensive information about the products they are using. This includes details about indications for use, dosing, warnings, contraindications, and potential side effects. Proper labeling is crucial for patient safety and for healthcare providers to make informed prescribing decisions.

Effective labeling helps to prevent misuse and ensures that patients understand how to use the medication correctly. This regulatory role is part of the FDA's broader mission to ensure that drugs and biological products are safe, effective, and properly labeled for consumer use.

While the FDA does evaluate the effectiveness of vaccines, regulates the distribution of herbal supplements to some extent, and oversees issues related to drug pricing, its primary role in regard to drug products is firmly centered around the accuracy and safety of labeling, making it the correct answer in the context of this question.