5 things to know about COVID-19 misinformation ‘super spreader’ Dr. Joseph Mercola — from Chicago roots to bizarre battles with government regulators

5. More recently, the FDA has targeted his claims about COVID-19. In February, the agency sent Mercola a warning letter about vitamins and other products that his websites or social media accounts have directed customers to purchase, indicating that they’re “intended to mitigate, prevent, treat, diagnose, or cure COVID-19 in people.”