★★☆Single study — solid evidence, such as one good trial or a large observational dataset, but not replicated at the top tier.
CBD is not a legal US supplement, and is sold as one anyway
Because cannabidiol was approved first as a prescription drug, US law puts it outside the definition of a dietary supplement. That is a legal mechanism, not a safety judgement.
What the study found
Cannabidiol cannot legally be sold as a US dietary supplement
Cannabidiol was approved first as the active ingredient in a prescription drug, which under US law puts it outside the definition of a dietary supplement and bars adding it to food sold across state lines. That is a legal mechanism, not a safety judgement — and firms sell it anyway.
The caveat · US federal law, not states or abroad
This is the agency's stated position under US federal law, not a court ruling and not a description of other countries or of individual states. The page was last updated in July 2024 and the law in this area moves.