The FDA and FTC have issued hundreds of warnings to companies selling products and services claiming, without adequate evidence, that they can prevent or treat COVID-19, but the possibility of government action doesn't seem to be a deterrence.
Paul Offit's new book covers the evidence for many surgeries, medications, and screening tests that have been proven ineffective and harmful yet are still being used by doctors who refuse to follow the science.
A new trial of turmeric (curcumin) for osteoarthritis suggest it may have medicinal effects.
Many health-related products are sold through multilevel marketing (MLM); now the FTC is warning them to stop making false claims about COVID-19. The tactics that MLMs use to promote all their products are deceptive and are a variation on the old Ponzi scam.
The FDA recently warned seven companies not to claim that their dietary supplements can prevent, treat, or cure a hangover, because only FDA-approved drugs can make such claims. The agency also warned that NAC, a popular supplement ingredient, cannot legally be used in dietary supplements.