Dietary supplements are regulated as a category of food, not as drugs, according to the U.S. Food and Drug Administration. Makers do not need FDA approval to sell a vitamin, mineral, or sports-nutrition ingredient before it reaches shelves. The agency instead sets manufacturing and labeling rules, then polices the market after products are already for sale.
What does "regulated as food" actually mean?
The distinction comes from the Dietary Supplement Health and Education Act of 1994 (DSHEA), which defines a dietary supplement as a product meant to supplement the diet — vitamins, minerals, herbs, amino acids, and similar ingredients taken by mouth — and places that category under food law rather than drug law, according to the National Institutes of Health's Office of Dietary Supplements (NIH ODS).
Under that framework, the FDA says manufacturers and distributors are responsible for evaluating the safety and labeling of their own products before marketing them, so they meet federal requirements. The agency does not test or certify products on the way to market. Its role begins with setting the rules companies must follow and continues once products are already being sold.
This is different from how the FDA treats medicines, which must clear the agency's premarket approval process before a company can sell them, per NIH ODS. A supplement can reach a store shelf the same way a food product does — no clinical trial, no agency sign-off, no review of the specific formulation.
Does a company have to prove a supplement is safe before selling it?
Not in most cases. According to NIH ODS, manufacturers do not have to give the FDA evidence of safety before marketing a supplement unless it contains a "new dietary ingredient" — one not sold in the U.S. before October 15, 1994. Ingredients already in use before that date are presumed safe based on their history of use, without a company having to submit new safety data.
For a genuinely new ingredient, the FDA does require a New Dietary Ingredient notification, referenced on the agency's dietary supplements program page as a distinct regulatory process from ordinary marketing. That notification is a filing to the FDA, not an approval the agency grants — the agency can object, but silence is not certification that the ingredient is safe.
Once a product is on the market, NIH ODS notes that the legal burden shifts: the FDA has to demonstrate a supplement is unsafe before it can act to remove it from commerce. That is the reverse of drug regulation, where a company must prove safety and effectiveness before selling anything at all.
What has to be true about what's actually in the bottle?
Since 2007, manufacturers have had to follow Current Good Manufacturing Practice (CGMP) rules that require them to verify "the identity, purity, quality, strength, and composition" of what they make, according to the FDA's backgrounder on the final CGMP rule. The FDA adopted the rule under DSHEA authority after documenting manufacturing problems including microbial contamination, undeclared ingredients, and products with the wrong amount of an ingredient.
In practice, CGMP requires testing and controls covering manufacturing, packaging, labeling, and storage, aimed at ensuring a product "contains what it is labeled to contain and is not contaminated with harmful or undesirable substances such as pesticides, heavy metals, or other impurities," per the same FDA document. A companion interim rule let manufacturers petition for exemptions from 100 percent identity testing on raw materials if they could show another method gave adequate assurance.
CGMP is a manufacturing-process standard, not a batch-by-batch public verification system. A consumer cannot look up an FDA test result for a specific bottle. What NIH ODS's Dietary Supplement Label Database (DSLD) offers instead is a public catalog of what is printed on supplement labels sold in the U.S. — ingredient names, forms, amounts, and full label statements, drawn from national surveys and voluntary manufacturer submissions — useful for comparing what a label states, though it does not independently verify that the contents match the label.
What can the label legally say?
Labeling rules are separate from safety rules. The FDA's dietary supplement labeling guide requires a "Supplement Facts" panel with serving size and the amounts of specific nutrients, and requires ingredients to be listed in descending order by predominance using common or usual names.
On claims, the labeling guide describes several categories a label can carry: nutrient content claims ("high potency," "good source"), authorized and qualified health claims, and structure/function claims about how an ingredient affects the body's structure or function. What a label cannot do, per NIH ODS, is claim the product will diagnose, cure, treat, or prevent a disease — that language is reserved for drugs, and any structure/function claim has to carry a disclaimer.
Because those claims are the manufacturer's own statements, evaluated by the manufacturer rather than verified by the FDA before use, a claim on a label is properly read as what the company asserts about its product, not as an FDA-confirmed fact.
Who checks quality after a product is already for sale?
Market surveillance is where FDA oversight becomes active rather than passive. The FDA monitors for products that are unsafe, adulterated, or falsely marketed and can act to remove them or request a voluntary recall, according to NIH ODS. Consumers can report a supplement-related adverse reaction directly to the FDA by phone or online, and the Federal Trade Commission separately oversees supplement advertising claims.
Outside of government, NIH ODS points to voluntary quality-testing programs run by independent organizations — it names ConsumerLab.com, NSF International, and the U.S. Pharmacopeia — that test products against manufacturing and label-accuracy standards. A seal from one of these programs is a real quality signal, but NIH ODS is explicit about its limits: it "does not guarantee that a product is safe or effective," only that the product met the tested organization's manufacturing or label-match standard.
Drugs and supplements, side by side
| Requirement | Prescription and OTC drugs | Dietary supplements |
|---|---|---|
| FDA approval before sale | Required | Not required |
| Who must prove safety first | The manufacturer, to the FDA | The manufacturer, to itself — except new dietary ingredients, which require FDA notification |
| Burden to remove from market | FDA can act on its own safety and efficacy findings | FDA must show the product is unsafe |
| Manufacturing standard | Drug CGMP | Dietary supplement CGMP (since 2007) |
| Disease claims allowed on label | Yes, if approved | No — structure/function claims only, with disclaimer |
This comparison reflects the regulatory pathway only, not the safety or effectiveness of any specific ingredient — those questions depend on the evidence for each substance, evaluated on its own.
Frequently asked questions
This article is for information only and is not medical advice. Anyone making a personal decision about a supplement should talk with a qualified clinician.
Does the FDA test supplements before they go on sale?
No. The FDA does not test or approve dietary supplements before they reach the market, according to NIH ODS. Manufacturers are responsible for evaluating their own products' safety and labeling before selling them, per the FDA.
What does a "Supplement Facts" panel have to include?
The FDA's labeling guide requires serving size, the amounts of listed nutrients, and ingredients ranked in descending order by predominance, using common or usual ingredient names.
Can a supplement label say it treats a disease?
No. NIH ODS states that supplement labels cannot claim to diagnose, cure, treat, or prevent a disease. Labels may carry structure/function claims about how an ingredient affects the body, with a required disclaimer.
What does a USP or NSF seal on a bottle actually verify?
According to NIH ODS, a seal from a voluntary testing program such as NSF International or the U.S. Pharmacopeia shows a product met that program's manufacturing or label-accuracy standard. It does not guarantee the product is safe or effective.
Can the FDA pull a supplement off shelves after it's already selling?
Yes, but the process differs from drugs. NIH ODS says the FDA can remove or request a recall of an unsafe or falsely marketed supplement, but the agency must first demonstrate the product is unsafe — the burden sits with the FDA, not the manufacturer.
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