By VFM Research Desk. Updated September 2026.
You’re Standing in the Supplement Aisle, Reading an Asterisk
You pick up a bottle. The front label says “Supports Healthy Testosterone Levels*.” You flip it over looking for the asterisk, and find a line of small print: “This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, support, or prevent any disease.”
That sentence shows up on nearly every supplement bottle in America, and most men skim right past it. But it’s actually the single most useful piece of information on the label — if you know how to read it. This guide breaks down the three types of claims a supplement label can legally make, what each one does and doesn’t promise, and how to spot language that’s quietly stepped over the line into a claim the product isn’t allowed to make.
Three Categories of Claims, One Set of Rules
Under the Dietary Supplement Health and Education Act (DSHEA), the U.S. Food and Drug Administration recognizes three distinct categories of claims on a supplement label, and each one carries different legal requirements.
Structure/Function Claims
This is the category behind most testosterone, prostate, and general wellness claims you’ll see. A structure/function claim describes how a nutrient or ingredient is intended to affect the normal structure or function of the body — not how it treats a disease. The FDA’s own examples are useful benchmarks: “calcium builds strong bones” and “fiber maintains bowel regularity.” A claim like “supports healthy testosterone levels” or “supports prostate function” fits this same pattern — it describes a normal bodily process, not a medical condition.
Here’s the part most readers don’t realize: structure/function claims are not reviewed or approved by the FDA before the product goes to market. The manufacturer is required to have evidence that the claim is truthful and not misleading, and it must notify the FDA in writing within 30 days of first using the claim — but nobody at the FDA signs off on the wording in advance. That’s exactly why the disclaimer exists: it’s the law’s way of telling you, the reader, “we haven’t checked this.”
Health Claims
A health claim describes a relationship between an ingredient and a reduced risk of a specific disease — for example, a claim linking a nutrient to lower risk of a particular condition. These claims are held to a much higher bar: unlike structure/function claims, health claims generally do require FDA review and authorization before a company can use them. You’ll see these far less often on men’s health supplements, because the evidence threshold is steep and the approved claim list is short.
Nutrient Content Claims
This is the simplest category — claims that describe how much of a nutrient is in the product, such as “high in vitamin D” or “excellent source of zinc.” These claims characterize quantity, not effect, and are governed by a separate set of labeling rules tied to Daily Value percentages.
A Four-Step Check You Can Run on Any Label
You don’t need a law degree to evaluate a claim — you need a short, repeatable habit. Here’s the sequence:
- Step 1 — Find the disclaimer. If a claim describes an effect on your body (energy, focus, testosterone, joint comfort, and so on) and there’s no “not evaluated by the FDA” disclaimer nearby, that’s a gap worth noticing — the disclaimer is legally required whenever this type of claim is made.
- Step 2 — Identify which category the claim falls into. Does it describe a normal body function (structure/function), a reduced disease risk (health claim), or a nutrient amount (nutrient content claim)? Most men’s supplement marketing lives in the first bucket.
- Step 3 — Check what the claim is not saying. “Supports healthy testosterone levels” is a legal structure/function claim. “Treats low testosterone” or “reverses hypogonadism” describes treating a diagnosed medical condition — a different legal category entirely, one that would require the product to be regulated and approved as a drug.
- Step 4 — Write down the evidence question you still have. A structure/function claim only requires that the company hold substantiation, not that it publish it on the bottle. If you want to know what that substantiation actually is, the honest next step is looking for the underlying research yourself or asking the manufacturer directly — not assuming the claim was independently verified because it’s printed on a label.
Where Marketing Language Crosses a Legal Line
The FDA draws a bright line here: it is not legal to market a dietary supplement to treat, prevent, or support a specific disease. A product marketed that way — whether the language is explicit or implied — meets the legal definition of a drug and would need to go through drug approval, which no over-the-counter supplement has done.
In practice, this means the language on the physical label tends to be more careful than the language in an ad, a sales page, or an influencer post for the same product. That gap exists partly because of how enforcement is split: the FDA is generally responsible for the safety, quality, and labeling of the product itself, while the Federal Trade Commission oversees advertising claims. A phrase you’d never see on the bottle — “reverses low T,” “cures ED,” “eliminates prostate symptoms” — sometimes shows up in marketing precisely because advertising and labeling fall under two different regulators.
Practical takeaway: read the marketing and the label as two separate documents. If the ad promises something the label’s careful, hedged language doesn’t, that mismatch itself is worth noticing.
What “Not Evaluated by the FDA” Actually Means
It doesn’t mean the claim is false. It doesn’t mean the claim is true, either. It means exactly what it says: the FDA has not reviewed this specific statement before it appeared on the shelf. The agency’s oversight of supplements is largely after-the-fact — inspecting manufacturing facilities, monitoring the marketplace, and investigating complaints — rather than pre-approving what a bottle is allowed to say. The FDA does not routinely test dietary supplements for content before they’re sold, and it doesn’t keep a master list of every product on the market.
None of this means structure/function claims are meaningless. Many are grounded in real, published research on the ingredient in question. It means the label itself isn’t the evidence — it’s a legally permitted summary that a company is required to be able to back up if asked, not proof that’s been independently checked.
A Simple Decision Path for the Next Label You Read
- Does the claim describe a normal body function (like “supports,” “maintains,” “helps”) rather than a disease? → Likely a structure/function claim. Look for the disclaimer.
- Does the claim mention treating, curing, reversing, or preventing a named medical condition? → That’s a disease claim. A supplement legally cannot make this claim — treat it as a red flag and consider whether you’re looking at label language or marketing language.
- Does the claim just state an amount (“500mg,” “high in”)? → Nutrient content claim. Compare it to the Supplement Facts panel on the same bottle to confirm the numbers match.
- Still unsure what the evidence behind a specific claim actually is? → That’s a legitimate open question, not a failure on your part. The label isn’t required to answer it, and the honest move is to look further before deciding, not to assume the claim has already been checked for you.
Frequently Asked Questions
If a claim has the required disclaimer, does that mean it’s true?
No. The disclaimer is a legal requirement that accompanies structure/function, nutrient deficiency, and general well-being claims — it tells you the FDA hasn’t evaluated the statement. It says nothing about whether the underlying evidence is strong, weak, or absent.
What’s the difference between a supplement label and a supplement ad making the same product’s case?
The label is regulated primarily by the FDA; advertising is regulated primarily by the FTC. Because they fall under different oversight, the language on a bottle and the language in a marketing campaign for the same product don’t always match — and the ad is often where bolder, less careful claims tend to appear.
Is “clinically proven” language the same as a structure/function claim?
Not automatically. “Clinically proven” is a marketing phrase, not a defined legal category. If you see it, that’s a good moment to apply the same check: what specific claim is it attached to, and is there a disclaimer or citation nearby that lets you trace it back to actual research?
The Bottom Line
A supplement label is written in a specific legal language, and once you can read it, the fine print stops being boilerplate and starts being useful. Structure/function claims describe normal body processes and don’t require FDA pre-approval — that’s exactly why the disclaimer exists. Health claims about disease risk require a much higher bar. And any claim to treat, support, or prevent a named disease has crossed into territory a supplement isn’t legally allowed to occupy. Knowing which category you’re looking at is the fastest way to separate a reasonable claim from an overreaching one.
This article is for general educational purposes only and is not medical advice. It does not evaluate the safety or effectiveness of any specific product or ingredient. Talk to a doctor or pharmacist before starting any new supplement, especially if you take prescription medication or have an existing health condition. To learn more about how VitaminsForMen.com sources and reviews information, see our How We Review page and our About page.
Sources: U.S. Food and Drug Administration, “Structure/Function Claims”; U.S. Food and Drug Administration, “Questions and Answers on Dietary Supplements.”