What is the best definition of a dietary supplement?

A dietary supplement is a product intended to enhance the diet by providing nutrients such as vitamins, minerals, amino acids, herbs, or other substances. These supplements are typically available in various forms, including pills, powders, and liquids. They are used to support overall health, fill nutritional gaps, or provide specific health benefits, but they are not meant to replace a balanced diet. Dietary supplements are regulated differently than medications, often requiring less rigorous testing for safety and efficacy.