Supplements fill entire aisles in American stores without having been approved by any agency. That follows from a specific regulatory category created decades ago and still in force.
Supplements are regulated as a food category
Federal law defines dietary supplements as a subset of food rather than as drugs, which places them under a fundamentally different regulatory scheme.
Drugs require demonstration of safety and effectiveness before sale, while supplements require neither, and manufacturers are responsible for their own safety determinations.
Agencies act primarily after a product is on the market, which means removal typically follows reported harm rather than preventing it.
Claims are limited by wording rules
Labels may describe an effect on the structure or function of the body but may not claim to treat, cure or prevent a disease.
This produces the familiar vocabulary of supporting, promoting and maintaining, which is a legal boundary rather than a description of demonstrated effect.
The accompanying disclaimer stating that claims have not been evaluated is required precisely because no evaluation occurred, and it appears on every product regardless of how much research sits behind the ingredient.
Advertising is policed separately by a different agency concerned with deceptive marketing, which is why the same claim can be acceptable on a label and challenged in a commercial.
Manufacturing rules govern process, not efficacy
Good manufacturing practice requirements apply, covering identity, purity, strength and composition, and facilities are subject to inspection.
Those rules address whether the product contains what the label says, not whether the ingredient does anything for the person taking it.
Independent testing programs offer verification of contents for products that participate, and participation is voluntary rather than universal.
Contamination is the recurring problem
Products marketed for weight loss, athletic performance and sexual function have repeatedly been found to contain undeclared pharmaceutical ingredients.
Because those categories promise effects that plant extracts rarely deliver, they attract adulteration, and enforcement actions cluster there consistently.
Botanical identity is a separate issue, since substitution of a cheaper plant can occur far upstream in the supply chain and remains invisible without laboratory testing of the finished product.
Why interactions matter more than people expect
Supplements can affect how the body processes medications, altering the concentration of a prescribed drug in ways that are clinically significant.
Because supplements are not prescribed, they are often absent from a medication list, which removes the check a pharmacist would otherwise perform.
Anyone taking prescription medication, preparing for surgery, or pregnant should review supplements with a physician or pharmacist rather than assuming that unregulated means harmless.