A product intended for use in diagnosing, curing, mitigating, or treating disease would
meet the definition of a "drug" under FDA regulation. Dietary supplements (herbs or hemp products) can not be marketed on medical claims. Violations of this FDA rule will result in warning letters for initial offenses and FDA actions for repeated offenses.
Examples for herbal medicine and hemp products with inappropriate medical claims of treating or preventing covid19 infection are below:

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