Vitamin D Doesn’t Protect You From Severe COVID, Study Finds

Throughout the COVID pandemic, many experts have theorized that boosting the immune system through simple methods like taking vitamins could help fight the coronavirus. Even White House COVID advisor Anthony Fauci, MD, has suggested taking certain supplements to boost your immune system amid the pandemic. But a new study has found that a highly regarded vitamin may not really protect you from severe COVID as many expected. Read on to find out which vitamin was just shown to be ineffective against a severe case of the virus, and for a way to stay safe from COVID, see why inhaling this could reduce your serious risk of COVID by 90 percent, according to A study.

Vitamins with spilled content

A new study from Brazil published on February 17 in the Journal of the American Medical Association has debunked the idea that vitamin D will make a big difference for COVID patients. The researchers reviewed the cases of 240 hospitalized COVID patients who were not yet receiving ventilation or ICU care. They were given a single dose of vitamin D or a placebo between June 2 and August 27. After looking at how their cases progressed, the researchers found that the supplement had no significant effect on moderate to severe coronavirus cases.

Both those who received vitamin D and those who did not report an average hospital stay of seven days, meaning that using vitamin D as a treatment method for these patients did not appear to improve their disease. According to the study, there were no significant differences between the groups in terms of death, admission to the ICU or need for a ventilator.

Study Results “Do Not Support Routine Vitamin D Administration In Hospitalized Patients With Moderate To Severe COVID-19”, US Physicians David Leaf, MD and Adit Ginde, MD, wrote in a statement accompanying the study. And to learn more about what puts you at risk for a severe case, if you’ve had this common illness, you’re more likely to die from COVID.


While a single dose of vitamin D did not appear to have a positive effect on the progression of COVID cases in hospitalized patients, it also did not produce any negative side effects. According to the study, no adverse events were reported after patients received a single high dose of vitamin D, only one case of vomiting.

However, in another study published in JAMA network open On February 12, researchers from the Cleveland Clinic found that COVID patients who took 10 days of high doses of vitamin C reported gastrointestinal problems such as nausea, diarrhea, and stomach cramps. And to learn more about treatments that seem to be working, see This Common Drug Could Reduce Your Risk of Death from COVID, Study Finds

Young man in white shirt standing in white bathroom taking vitamins from a pill bottle in hand

The Cleveland Clinic study involved 214 COVID patients recovering at home. The researchers assigned some of them to take high doses of zinc, vitamin C, or both supplements at random for 10 days, while other patients were not instructed to take supplements and instead were told to rest, hydrate. and take medications to reduce fever. However, the researchers saw “no significant difference” in symptom reduction in those who took the supplements compared to those who did not. And to get more updated COVID news delivered right to your inbox, sign up for our daily newsletter.


While vitamin D may not be an adequate treatment for COVID, previous studies have concluded that vitamin D deficiency can be detrimental amid the pandemic. A September study published in Journal of the American Medical Association found that those with vitamin D deficiencies were 77 percent more likely to test positive for COVID than those with adequate levels of vitamin D. And an October study published in the Journal of clinical endocrinology and metabolism found that 82.2 percent of hospitalized COVID patients were vitamin D deficient and had lower levels of vitamin D than those who were not infected with the virus. And for another surprising factor that puts you at risk, check out If you’ve done this recently, you’re 70 percent more likely to get COVID.

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