How to Read a U.S. Supplement Label: Serving Size, Daily Value, Ingredients, and Directions
A dietary supplement label contains several sections that serve different purposes. Reading them in a consistent order makes comparison easier and reduces the chance of confusing marketing language with the detailed product facts.
1. Serving Size
Start with the serving size because the listed nutrient amounts are tied to it. A serving can be one capsule, multiple capsules, a scoop, a packet, a teaspoon, or another quantity.
2. Supplement Facts
This panel lists dietary ingredients and amounts per serving. Some nutrients have a percent Daily Value; others may not.
3. Percent Daily Value
%DV provides reference context for nutrients with an established Daily Value. A missing %DV does not mean the ingredient is unimportant or that the label is incomplete; some dietary ingredients do not have an established Daily Value.
4. Other Ingredients
Capsule shells, carriers, flavors, sweeteners, colors, and other non-dietary ingredients are generally listed separately from the Supplement Facts ingredients.
5. Directions and Warnings
Read the product-specific directions, storage instructions, and warnings rather than assuming similar products are used identically.
6. Front-Label Claims
Terms such as “high potency,” “vegan,” “third-party tested,” or “non-GMO” should be reconciled with the detailed label and, where relevant, supporting documentation.
7. Manufacturer or Distributor Information
Use the company and contact information to identify who is responsible for the product and where to direct product-specific questions.
Quick Checklist
- Serving size
- Amount per serving
- %DV where applicable
- Other ingredients
- Directions
- Warnings and storage
- Claim evidence
Go One Step Further: Is the Label Easy to Use?
A label can be technically complete and still be difficult to interpret if serving information, units, warnings, or claims are visually hard to find. Use the Supplement Label Readability Audit to review hierarchy, font size, contrast, spacing, and information density.
For how Nutribota separates current product facts, general ingredient education, and supporting evidence, see our Research & Editorial Standards.
A label is most useful when read as a complete document rather than by one large number or front-panel phrase.