Supplements, Colloidal Silver: FDA Warns 4 Companies For Products With COVID-19 Claims KEY POINTS The agency cited company posts and blogs that claim the products' efficacy against COVID-19 FDA urged the companies to make changes so they don't "misleadingly" represent their products The U.S. Food and Drug Administration (FDA) sent warning letters to four companies for promoting or selling products that the agency said has made misleading claims relating to COVID-19. This is a part of the agency's ongoing efforts to protect consumers. Even early on in the coronavirus pandemic, the FDA has...