For more than a decade, Dr. Joseph Mercola cautioned parents against a potentially lifesaving shot of vitamin K for their newborn babies: “Vitamin K shots are completely unnecessary for your newborn.”

But now, in a break from his past warnings, Mercola is saying he no longer believes that.

ProPublica contacted Mercola recently as it was preparing an article about babies who died as a result of their parents turning down the vitamin K shot. Mercola’s new point of view is just as unequivocal as his old one: “The data is clear: vitamin K saves lives,” he wrote in an April article on his website two days after ProPublica contacted him. He added: “Based on the totality of the published evidence, I support vitamin K prophylaxis for all newborns.”

He also directed parents to speak to their children’s pediatricians.

“Vitamin K deficiency bleeding is rare, but when it occurs, the consequences can be devastating and irreversible,” Mercola wrote. “A single injection at birth can prevent it. Please talk to your doctor.”

Mercola is a leading vaccine skeptic and an ardent supporter of Health and Human Services Secretary Robert F. Kennedy Jr. He is a popular figure online, with a Facebook page that has some 1.7 million followers. He sends out a daily newsletter and sells alternative treatments for a variety of ailments.

His reversal comes at a critical moment. Hospitals and research studies have documented an alarming jump in babies not receiving the vitamin K shot, which has been recommended by the American Academy of Pediatrics since 1961 to help newborns’ blood to clot. Without it, research shows, babies are 81 times more at risk for late vitamin K deficiency bleeding, which can be fatal.

Just as has happened with measles and other vaccines, vitamin K shots have become the target of a deluge of false information online. That has caused some parents to view it as an unnecessary pharmaceutical intervention amid a lingering mistrust of the medical system following the COVID-19 pandemic.

Some point to a 2010 post from Mercola, entitled “The Dark Side of the Routine Newborn Vitamin K Shot.” A doctor in Tennessee recalled reluctant families citing the article, as did doctors in Oregon.

In the years that followed, Mercola stood by his opposition. He reiterated his position in 2014, after four babies in Nashville, Tennessee, suffered vitamin K deficiency bleeding. And he did so again in 2019, after hospital staff contacted child protective services in Illinois and took temporary custody of a newborn whose parents refused the shot for their baby.

In place of the shot, Mercola had recommended vitamin K drops, which are taken orally and have been touted online as a popular alternative. The drops, however, are not approved by the Food and Drug Administration and research shows they are not as effective as the shot, though they are used in some European countries.

In his April article, he addressed the rampant false information online regarding the vitamin K shot and acknowledged the role his writing may have played in spreading it. “The internet contains a significant amount of misinformation about vitamin K,” Mercola wrote. “Some of it may reference my own 2010........

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