What type of information is useful but not mandatory on OTC product labels?

The NDC (National Drug Code) number, while useful in identifying the specific drug product, is not mandatory on over-the-counter (OTC) product labels. The NDC provides a unique identifier for drugs marketed in the United States, which can be helpful for healthcare professionals, pharmacies, and consumers in distinguishing between different products. However, regulatory guidelines do not require its inclusion on OTC labels for the product to be legally compliant.

In contrast, items such as the drug expiration date, active ingredients, and directions for use are crucial for ensuring proper product safety and effectiveness and are mandatory to include on labels. The expiration date informs consumers about the timeframe during which the product remains effective and safe to use. Active ingredients must be clearly listed to inform users about the actual components that may affect their health. Directions for use provide essential information on how to safely and effectively utilize the product. Therefore, while the NDC number adds valuable information, it does not carry the same regulatory necessity as the other components.