Dr. Mercola, 67, an osteopathic physician in Cape Coral, Fla., has long been a subject of criticism and government regulatory actions for his promotion of unproven or unapproved treatments. But most recently, he has become the chief spreader of coronavirus misinformation online, according to researchers.

An internet-savvy entrepreneur who employs dozens, Dr. Mercola has published over 600 articles on Facebook that cast doubt on Covid-19 vaccines since the pandemic began, reaching a far larger audience than other vaccine skeptics, an analysis by The New York Times found. His claims have been widely echoed on Twitter, Instagram and YouTube…

Over the last decade, Dr. Mercola has built a vast operation to push natural health cures, disseminate anti-vaccination content and profit from all of it, said researchers who have studied his network. In 2017, he filed an affidavit claiming his net worth was “in excess of $100 million.”

And rather than directly stating online that vaccines don’t work, Dr. Mercola’s posts often ask pointed questions about their safety and discuss studies that other doctors have refuted. Facebook and Twitter have allowed some of his posts to remain up with caution labels, and the companies have struggled to create rules to pull down posts that have nuance.