Which piece of information is essential on the label of an OTC product regarding usage?

The essential piece of information that must be included on the label of an OTC (over-the-counter) product regarding usage is the directions for use. This component is crucial because it provides guidance to consumers on how to safely and effectively use the product. It typically includes details such as the appropriate dosage, frequency of administration, and any specific instructions for usage, which help ensure that the product is used correctly and minimizes the risk of misuse or adverse effects.

Including directions for use is mandated by regulatory agencies to promote safe self-medication practices, particularly since OTC products are available without a prescription and are frequently used by the general public. Providing clear directions helps consumers understand how to achieve the desired therapeutic outcome while also being aware of any potential warnings or contraindications that may apply.

The other options, while relevant to a complete understanding of the product, do not focus specifically on the critical aspect of safe and effective usage. Ingredients provide important safety and allergy information, but they do not guide how to use the product. A manufacturer's SWOT analysis is a strategic planning tool that is not required or relevant for product labeling. Journal references for safety may be useful for professionals in understanding the product’s background but are not necessary on the consumer-facing label. Thus, directions for use stand out