Vitamin D Is Still The Best Candidate For A COVID-19 “Magic Bullet”

Not That The FDA Or The CDC Will Ever Admit It

Peter Nayland Kust


There is, of course, nothing magic about vitamin D’s role in building a healthy immune system, which remains the best and most reliable way of fending off COVID-19 (and infectious disease more broadly). Good nutrition has always been understood to be foundational to good health.



Since February, additional studies have emerged that serve to amplify the basic thesis that vitamin D supplementation is both effective and essential in warding off the very worst outcomes of SARS-CoV-2 infection at the very least, and increasing one’s chances of avoiding symptomatic infection altogether.



Trinity College Study: Establishing A Causal Link

By far the most interesting study is a meta-study published online in Frontiers In Pharmacology in March by researchers from Trinity College in Dublin, Ireland, which establishes a causal link between vitamin D deficiency and SARS-CoV-2 infection (and in particular severe infection).


We conclude that reverse causality probably makes a minimal contribution to the presence of low vitamin D states in the setting of COVID-19. Applying the Bradford-Hill criteria, however, the collective literature supports a causal association between low vitamin D status, SARS-CoV-2 infection, and severe COVID-19 (respiratory failure, requirement for ventilation and mortality).

One point the authors make clear up front: low vitamin D levels has been unequivocally associated with severe COVID-19. The research on this point approaches the level of “settled science”.


Vitamin D deficiency is prevalent worldwide and low vitamin D status is associated with severe COVID-19 disease as described in over 900 papers from a variety of institutions and clinical settings, all reaching the same conclusion about low vitamin D status leaves little room for doubt or debate on the point.


More importantly, this study notes that research data shows that low vitamin D levels precede infection, rather than emerging during/after infection. The authors further note that research establishes that not only does vitamin D play an important role in immune system regulation, but that vitamin D impacts SARS-CoV-2 infection and COVID-19 severity in particular, inhibiting both the ability of the virus to invade host cells and the progression of the disease once infection has occurred.


Together, these observations support the hypothesis that a low vitamin D status plays an important role in the progression of disease, in part through elevations in serum IL-6 and prolonged IFNγ elevation.


All of the foregoing builds to the authors’ key finding that there is sufficient research evidence to support the assertion of a causal link using the Bradford Hill criteria which are a standard methodological tool for establishing causation.

Beyond confirming the causal link between low vitamin D, SARS-CoV-2 infection, and severe COVID-19, the authors also note the potential therapeutic benefits of vitamin D during disease progression.


As alluded to previously, recent meta-analyses indicate that vitamin D supplementation reduces the risk of acute respiratory infections generally, especially in people with the lowest serum 25(OH)D concentrations (Martineau et al., 2017; Jolliffe et al., 2021). These findings have recently been augmented by further meta-analysis of data indicating 3 to 4-fold reductions in risk of mechanical ventilation, ICU admission and mortality amongst hospitalized COVID-19 patients receiving vitamin D supplementation.


It should be noted here that high bolus doses of vitamin D are not an indicated therapy, but lower doses administered daily are most likely to have therapeutic effect.


Bolus doses also stimulate the fibroblast growth factor 23 (FGF 23)/24-hydroxylase counter-regulatory enzymatic pathways, meaning daily modest dosing is probably more effective than infrequent high dose bolus administration.


For the layman, the thrust of this research is clear and unambiguous: Daily vitamin D supplementation not only raises the odds of avoiding SARS-CoV-2 infection altogether, it minimizes symptoms when infection does occur, and additional vitamin D supplementation during the course of the disease can not only shorten the course of the disease but can also ameliorate the more severe outcomes, including ICU admission, mechanical ventilation, and mortality.


Penn State Study: Vitamin D Protects The Lungs

Another important bit of research to come out recently is this study from Pennsylvania State University, posted June 30 on the bioRxiv preprint server, using mice which shows vitamin D plays an important role in protecting the lungs during COVID-19 infection.


One of the more significant aspects of this study is that it analyzes the relevance of vitamin D in protecting against both the SARS-CoV-2 virus and the pandemic strain of H1N1 from 2009—which gives the study fairly broad implications in terms of overall immunological health.


As with the Trinity College study, the Penn State study takes note of the well-established link between vitamin D deficiency and poorer outcomes from infectious disease—COVID-19 in particular.


A recent systemic review concluded that low circulating levels of vitamin D (serum 25(OH)D, 25D) were associated with more severe symptoms, and higher mortality in patients with COVID-19.


Another important result from the H1N1 phase of the study was the results were not dependent on reduced viral replication, indicating that vitamin D plays a role in protecting lung (and presumably other) tissues.


The expression of the influenza M gene at d4 post-infection was not different in the 4 groups of influenza infected mice.

This finding is amplified by the concurrent observation that the vitamin D deficient mice showed signs of lung inflammation before infection with influenza virus.


Vitamin D clearly does much more for the body than simply strengthening the immune system, although within the context of COVID-19 research, the protective effect against COVID-19 within the lungs has particular relevance.


Together the data support an important role for vitamin D and Cyp27B1 in the regulation of the host response to H1N1 and SARS-CoV-2 viruses. The role of vitamin D includes the restraining of the IFN response shortly after infection. Vitamin D deficient hosts had pre-existing inflammation in the lungs that contributed to susceptibility to viral infection.


It is, of course, intuitively obvious that inflammation—and lung inflammation in particular—inherently increases susceptibility to infectious respiratory pathogens.



Vitamin D Deficiency Is Its Own Pandemic

It bears repeating that vitamin D deficiency is rampant the world over, and can be a particular health problem for particular ethnicities.


A recent University of Houston study appearing in the Journal of Pediatric Health Care showed that 61% of minority adolescents suffer from vitamin D deficiency.


Sixty-one percent of adolescents had low vitamin D levels. Vitamin D deficiency increased with age, independently of ethnicity or gender.


While vitamin deficiencies are an health concern in their own right, viewed in concert with the Penn State research which indicates vitamin D deficiency contributes to lung inflammation even prior to SARS-CoV-2 infection, the prevalence of vitamin D deficiency arguably becomes a co-morbid condition with respect to COVID-19, but also to infectious respiratory disease broadly.


Co-morbid conditions indicate a spectrum of immune system dysfunction. Another implication of this correlation is that comorbidities weaken the immune system and are themselves an indicator of a level of immune system dysfunction. The greater the dysfunction the less effective the vaccines.


While vitamin D should never be regarded as a panacea (there are no such concoctions in the real world), proper attention to one’s bodily health includes ensuring one is getting adequate vitamin D, be it from sunlight, diet, or nutritional supplementation (or some combination of all three). In addition to strengthening overall resistance to infectious disease, adequate vitamin D arguably can aid in preventing or ameliorating a number of the co-morbid conditions which raise the risks associated with COVID-19.


Who Needs Inoculations? Nobody

These latest studies (and, I should point out, there are several more which I have not mentioned for reasons of space and focus) bring me back to a point I made in February: Vitamin D supplementation1 is as effective or more effective than the mRNA inoculations.


This “best case” for the vaccines is that they were 88-93% effective against hospitalization for the Delta variant, falling to 70% effective against the Omicron variant.


By comparison, the Dror study indicates that vitamin D prophylaxis would be ~93% effective against hospitalization and ~94% effective against mortality. In other words, vitamin D is every bit as effective as the vaccines.


Let that thought sink in again: Vitamin D supplementation is as effective or more effective than the mRNA inoculations.

Two points immediately arise from this conclusion:

  1. The mRNA inoculations are utterly, completely, and eternally unnecessary, and always have been.
  2. The mRNA inoculations do not qualify for Emergency Use Authorization.

Recall that a significant consequence of the endless renewals of the Public Health Emergency declaration by the HHS Secretary Xavier Becerra is the ongoing use of Emergency Use Authorizations to allow otherwise unapproved medications—the mRNA inoculations, Paxlovid, molnupiravir, et cetera—to be used against COVID-19.


Perhaps the most impactful consequence of a Section 319 emergency declaration that it opens the door to FDA Emergency Use Authorizations of various unapproved drugs and medical devices, under section 564 of the Federal Food, Drug, and Cosmetic act, codified in the US Code as 21 USC 360bbb-3.


However, while PHE declarations may be made at the whim of the HHS Secretary, there are ostensibly objective criteria for an Emergency Use Authorization which must be met before an EUA can be granted. One of those criteria is that there can be no other option available.


(3) that there is no adequate, approved, and available alternative to the product for diagnosing, preventing, or treating such disease or condition;


Vitamin D is demonstrably adequate for preventing and for treating COVID-19. Vitamin D is obviously available, as it is an over-the-counter nutritional supplement—and the OTC status renders approval status moot. As no prescription is required for vitamin D, there is no need for regulatory approval. 


Even if one wanted to make a legal issue over approval status, with over 900 papers attesting to the relevance and efficacy of vitamin D in preventing, mitigating, and treating COVID-19, for the FDA to withhold approval would be on its face an arbitrary and capricious move wholly at odds with the FDA’s explicit mandate to be guided by scientific data and research (a mandate which, admittedly, is at this point observed exclusively in the breach).


Given the volume of research data attesting to vitamin D’s efficacy against COVID-19, arguably all of the medications granted EUA status by the FDA should never have received it. As a matter of legal requirement, the threshold for granting an EUA is, thanks to the wealth of vitamin D material, simply not met for any of them2.


Even if one were to accept the premise that COVID-19 qualifies as a Public Health Emergency, because of the significance and established efficacies of vitamin D supplementation in preventing and mitigating COVID-19, none of the Emergency Use Authorizations granted by the FDA should ever have been issued and should therefore be immediately withdrawn.


The FDA Is Unlikely To Act. You Are Still Free To Act

While it is almost certainly a pipe dream to expect the FDA to reform itself and rescind all EUAs pertaining to COVID-19 inoculations and therapeutics, you do not need to wait on the FDA’s pleasure. 


You have the power to take charge of your own health, not by getting endless mRNA shots which are poisonous and pointless, but by adjusting your diet and nutritional intakes to ensure that you are getting sufficient vitamin D to ward off COVID-19. 

You have the power to supplement your diet with additional vitamin D should you ever develop any of the flu-like symptoms associated with COVID-19 (and with Influenza Like Illnesses broadly). You can, thanks to the volume of research that has already been done, rest easy that vitamin D supplementation is highly likely to be beneficial regardless of the particular infectious respiratory pathogen which attacks.



Despite the pompous pronouncements of the FDA and the CDC, good health is and always has been the best defense against infectious disease. Despite the corrupt, cavalier, and clueless coercions of the FDA and the CDC to rely on futile mRNA inoculations or the equally futile Paxlovid and/or molnupiravir, vitamin D is almost certainly the best tool in the average person’s healthcare toolbox for defeating not just COVID-19, but all infectious respiratory disease. 



Vitamin D supplementation should be done with care. It is possible to overdose on vitamin D, which can have serious negative health consequences. Know how much vitamin D you’re taking, and never take too much.



Arguably, this threshold is also not met due to the extant research data showing efficacy for both Ivermectin and hydroxychloroquine as well. However, given that both of those medications require a doctor’s prescription, the approval element for both becomes rather more problematic vis-a-vis the necessity for Emergency Use Authorizations in a way that it does not with respect to vitamin D.