How Dietary Supplements Are Regulated in the US, and How That Differs From Drugs

Two different systems

In the United States, prescription and over-the-counter drugs must be shown to be safe and effective in clinical trials and approved by the FDA before they can be sold. Dietary supplements follow a different system, created by the Dietary Supplement Health and Education Act of 1994. Under that law, supplements are regulated more like foods: they do not need FDA approval before they reach the market, and they do not have to prove that they work ^[1].

This is the single most important fact for a buyer. When a supplement is on sale, it means nobody has stopped it, not that anyone has checked it.

Who is responsible for safety

The company that makes or distributes a supplement is responsible for making sure it is safe and that its label is truthful and not misleading ^[1]. For ingredients that were not sold as supplements before 1994, the company must notify the FDA in advance with evidence of safety. For older ingredients, no notification is required.

The FDA can act after a product is on the market, for example if it is found to be adulterated, mislabeled or unsafe, but the burden of showing a problem largely falls on the agency, not on the company.

Manufacturing rules

Supplement manufacturers must follow current good manufacturing practice, a set of FDA rules covering facilities, equipment, quality control, testing of ingredients and finished products, and record keeping ^[2]. Facilities must also register with the FDA. That is where the common label line made in an FDA-registered facility comes from.

Registration means the FDA knows the facility exists. It is not an endorsement, an approval or a certificate that a particular product meets its label. Inspections happen, but not before every product launch.

Labeling rules

The Supplement Facts panel, serving size, amounts, Daily Values, blends and other ingredients follow detailed federal rules ^[3]. A label must name the company responsible and give an address. Proprietary blends are allowed, with their total weight. These rules ensure a standard layout; they do not ensure that the doses are meaningful.

What supplements may and may not claim

Supplements may carry structure-and-function claims, statements about how a nutrient or ingredient affects normal structure or function of the body, such as supports healthy blood sugar levels already within the normal range. When they do, the label must carry the standard disclaimer that the FDA has not evaluated the statement and that the product is not intended to diagnose, treat, cure or prevent any disease, and the company must notify the FDA of the claim ^[4].

Supplements may not claim to treat, cure, mitigate or prevent a disease. Diabetes is a disease. A supplement page that promises the easiest way to manage type 2 diabetes, or testimonials describing diabetes readings returning to normal, are making the kind of claim the rules reserve for approved drugs.

Health claims and qualified claims

A separate category, health claims, describes a link between a substance and reduced risk of a disease. These need FDA authorization based on scientific agreement. When the evidence is weaker, the FDA can allow a qualified health claim with wording that states the uncertainty.

Chromium picolinate is an example. In 2005 the FDA allowed only a qualified claim about insulin resistance and type 2 diabetes, stating that the existence of the relationship is highly uncertain ^[5]. That is a regulator telling buyers, in plain words, that the evidence is weak.

Advertising and the FTC

The Federal Trade Commission regulates advertising, including websites and sales pages. Health claims in ads must be backed by competent and reliable scientific evidence. Endorsements and testimonials must reflect the honest experience of the endorser and, if they describe unusual results, the ad must make clear what typical results are; connections such as payment must be disclosed ^[6]. A 2024 rule bans fake reviews and testimonials and misleading review practices ^[7]. Long-standing guides warn against advertising a former price that was not genuinely charged ^[8].

This is why responsible sites disclose affiliate commissions and avoid unverifiable star ratings, and why crossed-out reference prices deserve skepticism.

Adverse event reporting

Companies that receive reports of serious adverse events from their supplements must forward them to the FDA. Consumers and clinicians can report problems directly through the FDA's MedWatch program or the FDA's supplement reporting page ^{[9] [10]}. Reports help the FDA spot patterns, such as the liver injury signals seen with some herbal extracts.

Health fraud and tainted products

The FDA runs a health fraud program that warns about products making false treatment claims, and about supplements found to contain hidden drug ingredients ^[11]. Products sold for diabetes and weight loss are among the categories that appear most often in those warnings. A product that claims to replace diabetes medicine, or works suspiciously fast, deserves particular caution.

What this means for a blood sugar buyer

• A supplement on sale has not been tested by the FDA for safety or effectiveness.
• The label must be truthful about ingredients, but may hide individual amounts in a blend.
• Claims about diabetes treatment are not allowed and are a warning sign.
• Testimonials and ratings on a seller's page are advertising.
• Your prescriber should know about every supplement you take, because some interact with diabetes medicine ^[12].

Phrases that sound official but are not

Several common label and marketing phrases sound like approvals and are not:

• FDA approved. Supplements are not FDA approved. A product claiming to be is either mistaken or misleading ^[1].
• Made in an FDA-registered facility. The building is registered; the product has not been reviewed.
• Clinically proven. Usually refers to studies of individual ingredients, often at different doses, not to the product.
• Doctor formulated. Says who designed it, not whether it works.
• Pharmaceutical grade. Has no regulatory meaning for supplements.

When you see these, look for the evidence behind them, and treat a lack of detail as part of the answer. A company that has real evidence usually links to it, names the study and states the dose that was tested.

Bottom line

The supplement system relies on companies to be responsible and on buyers to be informed. Reading the label, checking claims against the rules, and looking up the research behind each ingredient is the work the system leaves to you. Our label guide is a practical place to start.