What does the term 'purity' refer to in the context of supplements?

In the context of supplements, 'purity' specifically refers to the absence of contaminants or impurities. This means that a pure supplement contains the intended ingredients without unintended substances that could harm the consumer or dilute the effectiveness of the product. Ensuring that a supplement is free from harmful add-ons such as fillers, additives, or toxins is essential for maintaining its integrity and safety for consumption.

The other options address different aspects of supplements that, while important, do not pertain to the concept of purity. For instance, the caloric content relates to energy provided by the supplement, flavoring and coloring agents pertain to the sensory attributes of the product, and packaging and branding quality reflects how a product is presented rather than its content integrity.