Look for what you can verify.

For a product sold in the United States, start with its Supplement Facts panel. Check serving size, ingredient names, amounts per serving and other ingredients. A serving can include more than one capsule or tablet. Label formats vary by market, so read the information for the product and country in question.

Keep units and reference values in view. The U.S. percent Daily Value (%DV) expresses how much a serving contributes to an established daily reference. It does not show how much a particular person is missing or provide an individual treatment plan. A higher percentage alone is not a reason to choose a product.

Treat testing and certification as claims to check. An independent quality seal may provide information about manufacturing, label contents or contaminants, depending on the program. ODS emphasizes that such seals do not guarantee safety or effectiveness. Review what was tested rather than assuming that every seal means the same thing.

A practical review can separate three questions: What does the label say is in the product? What quality checks can be independently confirmed? What evidence supports the proposed health use? If a certification or test report is claimed, ask for the issuing organization, scope and a product or batch reference that can be checked.