A Simple Shot: A Popular Doctor Had Long Warned That Vitamin K Shots Are Risky for Newborns. Now He's Changed His Tune.

Dr. Joseph Mercola, a prominent figure with 1.7M Facebook followers who spent 14+ years discouraging parents from giving newborns vitamin K shots, publicly reversed his position in April 2026 after ProPublica contacted him for an article. He now states 'The data is clear: vitamin K saves lives' and supports vitamin K prophylaxis for all newborns, acknowledging his previous 2010 article reflected outdated views and may have contributed to spreading misinformation.

This does not prove that Mercola's reversal will substantially reduce the documented rise in babies not receiving the shot or reverse existing vaccine hesitancy. It documents one influential figure changing his stance but not measurable downstream health outcomes. It also does not address whether his other health claims have similar scientific backing.