Yes, Mercola Spent Years Opposing Vitamin K Shots for Newborns — And the Science Firmly Disagrees

The claim checks out factually: Mercola did maintain opposition to routine vitamin K injections for newborns across both 2014 and 2019. Archived articles from his website and reporting from Vox confirm he kept publishing content framing the shots as unnecessary or dangerous well into 2019. The Center for Countering Digital Hate also named him as a top health misinformation spreader, with his vitamin K content cited as a years-long example. So the timeline is accurate — but the science he was promoting was not.

Mercola's main arguments were that vitamin K injections are linked to childhood leukemia and that preservatives in the shots pose risks to newborns. Both claims fall apart under scrutiny. A systematic review published in Pediatrics, the journal of the American Academy of Pediatrics, examined the leukemia claim and found no credible evidence supporting it. The preservative concern has similarly not held up in clinical research.

What the evidence does show is that skipping the shot carries real, documented risk. Newborns are born with very low vitamin K levels, which are needed for blood clotting. Without the injection, some develop Vitamin K Deficiency Bleeding, or VKDB — a potentially fatal condition. A 2015 study in JAMA Pediatrics documented a cluster of VKDB cases in infants whose parents had refused the injection, and investigators found that Mercola's website was among the sources those parents had consulted. The CDC and AAP have consistently recommended the injection for decades precisely because the benefit is clear and the risks of skipping it are not theoretical.

To be fair to the strongest version of the concern: parents asking questions about what goes into their newborn's first medical intervention is not unreasonable. That instinct to scrutinize is healthy. The problem is when that scrutiny is guided by sources that misrepresent or cherry-pick evidence, leading families toward a choice that puts infants in genuine danger.

This kind of misinformation spreads because the emotional stakes are as high as they get. A newborn is the most vulnerable person imaginable, and any suggestion that a routine medical procedure could secretly harm them will get attention. Mercola's framing — that mainstream medicine is hiding dangers from you — is a reliable engine for shares and clicks, especially in communities already skeptical of medical institutions. The tell is always the same: vague warnings, refuted studies presented as settled, and no honest accounting of the risks on the other side.