In short
- Many popular label phrases have no single legal definition for supplements.
- "Supports" claims are allowed only with a standard FDA disclaimer; "treats" and "cures" claims are not allowed.
- "Clinically studied" does not tell you which study, which dose or whether it was on this product.
- The Supplement Facts panel and the ingredient list are the facts; the front of the bottle is marketing.
The front of a supplement bottle is a billboard. It has about a second to get your attention, so it uses short, confident phrases: "natural", "pure", "clinically studied", "pharmaceutical grade", "maximum strength". Some of those phrases mean something specific. Many do not. This glossary explains the ones you will meet most often, so you can enjoy the packaging without being steered by it.
The rules in one paragraph
In the United States, dietary supplements are regulated as a category of food under a 1994 law. Manufacturers are responsible for the safety and labeling of their products, and they are required to follow current good manufacturing practices. The FDA does not approve supplements before they are sold. Supplements may describe how a nutrient affects the structure or function of the body (a "structure/function claim") but may not claim to diagnose, treat, cure or prevent a disease. A structure/function claim must carry the statement: "This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease."
Glossary
"Supports ..." or "promotes ..."
A structure/function claim. The word "supports" is carefully chosen: it describes a general role without promising a medical result. It tells you what the marketer wants you to associate with the product, not what it will do for you personally.
"Natural"
There is no single legal definition of "natural" for dietary supplements. It may mean an ingredient is derived from a plant, mineral or animal rather than made in a lab, or it may mean little more than a mood. It is not a statement about safety: some natural substances are hazardous in the wrong amount or for the wrong person.
"Clinically studied" or "clinically proven"
Ask three questions. Which study? Which ingredient and dose? Was it this exact product? A claim may refer to research on one ingredient at a dose much higher or lower than the amount in the bottle, or on a different form, or on a very small group. Reliable brands name the ingredient and cite the research; vague claims deserve less trust than specific ones.
"Pharmaceutical grade"
This phrase has no recognized legal meaning for dietary supplements. A related and legitimate term is "USP grade", which refers to ingredients meeting standards set by the United States Pharmacopeia, or a USP Verified seal on a finished product, which means the product was submitted to that program and passed its tests. "Pharmaceutical grade" on its own is marketing language.
"Third-party tested"
Useful if you know who tested it and for what. Independent testing can cover identity (is the ingredient what the label says), potency (is the amount right), contaminants (heavy metals, microbes) and dissolution (does the tablet break down). Organizations such as USP and NSF run voluntary programs and publish lists of the products they have certified. A brand that names its tester and makes results available gives you more than one that simply says "tested".
"Non-GMO", "gluten-free", "vegan"
These are specific statements about ingredients and are meaningful when stated honestly. "Gluten-free" has an FDA definition for foods, which applies to a product labeled that way. "Non-GMO" may be verified by a certifier, in which case the certifier's seal is on the label. "Vegan" means no animal-derived ingredients, which includes capsule shells. Verify any of them in the ingredient list.
"Organic"
When a supplement carries the USDA Organic seal, it has been made to the USDA's organic standards. "Made with organic ingredients" is a weaker statement about part of the product.
"Whole food" or "food-based"
These suggest the nutrients come from concentrated foods and not isolated compounds. Sometimes that is true; sometimes the product is a normal vitamin blend mixed with a small amount of food powder. Check the panel for the actual amounts.
"Maximum strength", "high potency"
Relative terms. Compare the actual amount per serving and the % Daily Value with other products and the upper limits in our guide to vitamins and minerals.
"Proprietary blend"
A legal labeling format that shows the total weight but not the amount of each ingredient. See Blends and proprietary formulas.
"Doctor recommended", "number one", "best seller"
Unless the label says which doctors, how many, according to which survey, or in which store or period, these phrases cannot be checked. You do not have to disbelieve them; you just cannot rely on them.
Where the facts are
- Supplement Facts panel: the amounts, the forms and the % Daily Value.
- Other ingredients: what else is in the product.
- Warnings and suggested use: what the manufacturer says about who should take care.
- Lot number and expiry: proof that the product can be traced.
- Seals: any independent verification, named on the label.
Everything else is context. Our guide to reading a label takes you through the panel step by step.
How we describe products in the shop
We show each product's name, brand, price and images, and the details supplied by the manufacturer or supplier. Some product names include the brand's own marketing wording, such as a guarantee or a quality description; that wording belongs to the brand, and a brand's guarantee is not a guarantee from us (our own terms are on the Shipping & Returns page). We do not add claims of our own. If a claim on a package matters to you, the package label is the primary source; if you need a specific answer, contact us and we will tell you what we can confirm.