The Promise & Perils of Vitamin D

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Different Medicines Placed on White Surface

by Bill Sardi via

With more than a decade-long head start, one would have thought vitamin D would have cured cancer by now, if not Covid-19.  There are over 10,000 reports about vitamin D supplementation published in the past 10 years, posted at the National Library of Medicine.

But all is not rosy in vitamin-D Land.  Speaking out of two sides of their mouths, researchers say vitamin D does/doesn’t work; say over a billion people on earth are vitamin D deficient, but also say they the public is wasting money on sunshine pills.

Which is it?  A wonder cure, or the biggest disappoint in nutritional medicine?

The answer is, it will be what modern medicine chooses it to be, because the delivery of medicine today is on the medical industry’s terms, not determined by public needs or demands.

Like mafia, the medical industry has to get a cut of the pie, or it will malign and disqualify whatever threatens its income. As a dietary supplement, the public’s direct access to vitamin D without doctoring is a problem for modern medicine because of vitamin D’s broad ability to quell many diseases.  The biggest confounding factor in vitamin D science is the medical profession itself.

When did the vitamin D revolution begin?

The vitamin D revolution was signaled by leading researchers over a decade ago.  Drs. Cedric and Frank Garland who connected vitamin D deficiency to cancer with their ground breaking report published in 1980 and Dr. Michael F. Holick who wrote about the “vitamin D pandemic;” and Bruce W. Hollis PhD who contributed to the science of blood testing, were the researchers who led the way.

Called the “nutrient of the decade” in 2010 by Ronald Hoffman MD, former president of the American College for Advancement in Medicine, this vitamin/hormone came out of the research closet to offer far more health benefits than its widely advertised ability to utilize calcium for bone growth and prevent rickets in growing children.  Vitamin D’s greatest promise is its central role in the immune system and should be front and center in infectious disease and cancer prevention.

Living in the dark

How could such a widespread deficiency plague modern man when it is free, not confined to dietary or supplemental sources, and all that is required to be vitamin D sufficient is to walk outside in midday sun, at least in southern latitudes.

Essential for human life, the vitamin D tank must never be empty.  Months of it are literally stored in the liver in summer months to get through winter.  A mega-dose of injectable vitamin D maintains elevated blood levels for 84 days.  Older women often have 300,000 units of vitamin D injected for wintertime bone protection without side effect.  Even large single oral doses up to 300,000 units are safe and effective.

Safe upper limit

It is inconceivable that a 4000-unit vitamin D pill (the so-called safe upper intake limit) could be problematic beyond that point.  4000 international units (IU) is just 1/10th of a milligram (100 micrograms).  This preposterous safety limit point exposes the sun/vitamin D phobia that now prevails in modern medicine. (More about this below.)

The costs

Vitamin D inadequacy costs ~$40-50 billion a year (2004 data) whereas sun-related diseases (skin cancer) costs ~$6-7 billion a year in the US.  Modern medicine knows, if vitamin D adequacy could be achieved by the entire population, $40-50 billion in insurance reimbursements to doctors and hospitals would be taken out of its pockets.  The medical industry recognizes the vitamin D revolution can’t be stopped, but it can stall for time.

How much supplemental vitamin D are Americans taking?

WebMD provides usage data: In 1999-2000, 0.3 percent of U.S. adults took 1,000 IUs or more of vitamin D daily.  By 2013-2014, slightly more than 18 percent of adults were taking that much vitamin D daily.

In 2007-2008, 0.2 percent of Americans took 4,000 IUs or more daily. By 2013-2014, that number was 3.2 percent.

Demand for D supplements soar

Vitamin D’s real promise has yet to be realized for a great portion of human populations, even though the demand for this vitamin as a dietary supplement has grown from $30 million in 2008 to over $770 in the US annually (2021), and projected to reach $1.6 billion globally by 2025.

$770 billion divided by a population of 328 million Americans amounts to just $2.34 per year per capita.  The tab for 200 million Americans taking a $10/month vitamin D pill would amount to $2.4 billion, showing the market potential for this supplement.

Why wait for symptoms of D-deficiency to arise and then inappropriately treat the symptoms with anti-inflammatory, anti-germicidal and anti-depressant drugs?  That is the common practice today.  Given there are more than 100 types of autoimmune diseases, and vitamin D normalizes body-against-itself autoimmunity, suggests a large number of health benefits can accrue from making vitamin D a new paradigm in modern medicine.

Typical blood concentrations by dose

What are the typical blood concentrations achieved by supplementation?

For reference, there are two ways to measure blood levels of vitamin D: nanograms per milliliter and nanomoles per liter.

1000 IU: 12.4 nanograms/milliliter/ nanomole per liter

Vitamin D-deficiency is defined as below
20 nanograms/milliliter or 50 nanomoles/liter blood sample

5000 IU: 27.8 nanograms/milliliter/ 69 nanomoles per liter

10,000 IU: 48.1 nanograms/milliliter/ 24,960 nanomole per liter

That makes 1000-4000 mg vitamin D pills almost worthless, save for sunshine that prevents abject deficiency.

Canadian researcher Reinhold Vieth showed a 400 IU/day dose for several months achieves little or no detectable effect on the circulating concentration of vitamin D.  Embarrassingly, that is the amount of vitamin D in fortified milk for many years – a useless dose.

What percentage of US population is D-deficient?

A 2011 report published in Nutrition Research estimated Vitamin D deficiency (defined blood serum concentrations below ≤20 nanograms/milliliter/50 nanomoles/liter) was 41.6%, with the highest rate seen in blacks (82.1%), followed by Hispanics (69.2%).

In winter, every American living above the 37th parallel except vitamin D-supplement users is probably vitamin D-deficient.

Why not food fortification?

What about fortifying foods?  The World Health Organization (WHO) says food fortification is supposed to kick in “to provide most (97.5%) of the individuals in the population group(s) at greatest risk of deficiency with an adequate intake of specific micronutrients, without causing a risk of excessive intakes in this or other groups.”

Therefore, when 2.5% of the population has blood levels below 10-12 nanograms per milliliter/ 25-30 nanomole/liter blood sample, food fortification should be implemented.  Milk is fortified with 400 units of vitamin D for growing children who need vitamin D.  Obviously, food fortification isn’t working.

Provision of vitamin D from the diet is insignificant

Using data from a 2009-2012 study, the dietary intake of vitamin D below the Estimated Average Requirement (EAR) was 100%!  About 80% of vitamin D comes from solar UV-B radiation and about 20% comes from the diet.  Thank God for sunlight.

Public health authorities recommend a miniscule 400-800 IU (10-20 micrograms) of vitamin D to achieve blood levels in the range of 25-50 nanomole/liter or 10-20 nanograms/milliliter blood sample.  If every American achieved this blood level, they would all be on the border of deficiency, especially if living in northern climates where the effects of the tilting of the earth away from the sun during winter months reduces solar radiation and natural production of vitamin D.

These numbers appear to be ridiculously low when compared to sunlight exposure.  Just 10 minutes in midday sun without sunscreen with skin exposed will generate ~10,000 units of vitamin D (1000 units per minute)!  So, the 400-800 IU recommendation for food fortification equals less than a minute of sunshine.  That is absurd!

The Food & Nutrition Board established the safe upper limit for vitamin D at 4000 IU (100 micrograms) per day, which is equivalent to 4 minutes of sunshine.  That is also absurd.  Have you ever heard of anybody developing vitamin D toxicity from going out in the sun for more than 4 minutes?

I hope readers are following along here how modern medicine is about as fearful of sunlight as Count Dracula.

Understanding vitamin D metabolism

According to Dr. Bruce Hollis, affiliated with the Medical University of South Carolina:

The circulating half-life of the intermediate form of vitamin D (calcidiol) is many weeks; for vitamin D3 it is 1 day; and for activated vitamin D (calcitriol) it is a few hours.  Vitamin D is eventually excreted in bile, feces and urine.  Therefore, the only known way to maintain constant vitamin D blood levels is daily supplementation or skin/sun exposure to solar UV rays.

Even a 100,000-unit dose of vitamin D is cleared from the blood circulation within a week, making vitamin D basically undetectable (though some is stored in the liver).  Thus, the only known way to sustain constant circulating vitamin D concentrations is by daily supplementation and/or chronic UV exposure.

A 400 IU/day dose for several months will achieve little or no detectable effect on the circulating concentration of vitamin. D However, if one supplements for extended periods with 2000–6000 IU/d vitamin D3, stable circulating concentrations of vitamin D are maintained in the range of 10–40 nanograms/milliliter.  Dosing of 400, 1000, 2000, or 4000 IU/day; 28 000 IU/week; 120 000 IU/month; 360,000 IU every 3–4 months will maintain vitamin E levels without over-calcification.

Daily doses of vitamin D result in stable circulating concentrations of both D3 and intermediate calcidiol, whereas weekly or longer interval dosing will result in large fluctuations in circulating vitamin D but stable concentrations of calcidiol in the liver, the intermediate form of vitamin D.  Nursing mothers need 6000 IU/day of vitamin D3.

Plethora of vitamin D studies with declaration of pandemic

The Covid-19 pandemic produced a plethora of vitamin studies in a short time.  With no vaccines in place, the Covid-19 pandemic took second-tier treatments like vitamins and thrust them to the front of the battle to save human lives from a mutated virus that no human had immunity from.  Vitamin D/Covid-19 studies were initially positive:

·      An oral bolus of 80,000 IU of vitamin D3 prior to a Covid-19 diagnosis lowered the mortality rate.

·      When middle-age adults who tested positive for Covid-19 were given 60,000 IU of vitamin D3 daily for 7 days or an inactive placebo pill, more than 60% tested negative within 21 days compared to 20.8% showed negative in the placebo group.

·      According to one study, Covid-19 patients tend to have pre-infection vitamin D deficiency, defined as less than 20 nanograms/milliliter blood sample.  Covid-19 patients were (14.3 times increased risk to be vitamin D deficient and 2.031 times more likely to have diabetes, and these patients had higher rates of mortality and co-morbidities.

·      Another interesting observation is that solar UV radiation correlates with reduced severity of Covid-19 infection and low incidence of Covid-19 infection altogether.  If the timing of vaccination correlates with the summer increase in UV radiation, that will make the Covid-19 vaccines falsely appear to be more effective.

·      Vitamin D and its derivatives (calcidiol, calcitriol) bind to the ACE2 doorway that allows Covid-19 to enter cells and replicate and therefore blocks Covid-19 infection.

·      A revealing study of Covid-19 patients was undertaken.  Covid-19 patients without symptoms (asymptomatic) vs severely ill patients in hospital. Here are the results of that study:

Vitamin D studies fizzled

But then vitamin D supplementation fell into disrepute.  The mistaken presumption is those who are vitamin D-deficient will benefit from supplementation.  But that isn’t always the case.

Apart from Covid-19, rigorous vitamin D studies didn’t find any health benefit.  A landmark study published in 2018 found vitamin D supplementation did NOT boost bone mineral density and prevent falls and hip fractures.  But of course, among post-menopausal females who are prone to fractures, another hormone, estrogen, is responsible for maintaining bone density.  Same goes for testosterone for males.  Conclusion: researchers were putting the wrong hormone to the test.

In another example, a study published in 2019 in the New England Journal of Medicine did not result in a lower incidence of invasive cancer or cardiovascular events compared to an inactive placebo.  However, a significant reduction in colon cancer risk was shown for free-unbound vitamin D, which is addressed later in this report.

Other studies revealed vitamin D levels unexpectedly correlated with an increase falls and fractures among older women.  A review of 137 diseases concluded any claim vitamin D is associated with reduced disease incidence is spurious.  Vitamin D deficiency was called a “pseudo disease,” and vitamin D pills as an “imposter” substitute for sunshine.

Then came the Covid19 pandemic and contrary studies:

·      Vitamin D supplementation among Covid-19 patients was found to be inconclusive and may be skewed by unknown confounding factors.

·      Even when a single high-dose of vitamin D3 was administered (200,000 IU) there was no effect on days of hospitalization.  However, other studies came to a different conclusion and recommended vitamin D supplementation for Covid-19. Why?

·      Of interest is a study where 42% of Covid-19 patients were vitamin D deficient blood levels (below 20 nanograms/milliliter of blood sample) and the odds of infection were 3.3 times greater among those with D deficiency.  However, there was no significant association between vitamin D status and mortality.  Another study found the same thing, that vitamin D deficiency decreased the risk for severe Covid-19 disease but not a fatal outcome.

·      Researchers went further in their investigation and employed genetic screening to determine if inherited factors predisposed individuals for higher or lower vitamin D blood levels and increased or decreased risk for Covid-19 infection and mortality.  There was no association between genetically-predicted vitamin D levels and Covid-19 susceptibility.  However, the study in question did not include vitamin D-deficient individuals.

Despite the negative studies, 80% of Covid-19 patients are vitamin D deficient.

Investigation into vitamin D as a nutrient to prevent, treat and even cure Covid-19 reveals voluminous evidence a deficiency of the active form of this sunshine hormone/vitamin (calcitriol) is responsible for an estimated 87% of Covid-19 deaths.

Don’t blame failed studies on vitamin D

There are known reasons why vitamin D doesn’t work.

·      Obesity is another factor that reduces vitamin D blood levels.  Obese adults need 2 to 3 times more vitamin D than lean adults to treat vitamin D deficiency.  Body weight per day could explain 34.5% of variation in circulating vitamin D.
There is far greater incident cancer reduction among normal-weight adults than obese adults when taking vitamin D.  In the US obese Covid-19 patients are 1.8 to 3.6 times more likely to be admitted to the ICU.  In China, 88% of deceased Covid-19 patients were overweight.

·      One study shows nearly 80% of patients with chronic kidney disease have low vitamin D levels.  As readers learn here, the kidneys are where the final step of vitamin D metabolism occurs, where calcidiol is converted to the active form of vitamin D, calcitriol.  I in 3 diabetics have kidney disease.

·      Chronic alcohol intake reduces circulating vitamin D and impairs immunity.

·      Serum vitamin D levels are lower among women with autoimmune hypothyroidism.  Of note, a deficiency of the trace mineral zinc impairs thyroid hormone levels.

More than meets the eyes

There is lot more to vitamin D than meets the eye.  Excessive vitamin D could result in over-calcification, so the body makes vitamin D in the skin upon exposure to solar ultraviolet radiation, stores it in the liver that keeps a few months supply to get through winter, then converts it to its active form (calcitriol).  Vitamin D in the blood is predominantly the bound form, with only ~1% being unbound and bioavailable.

The crux of vitamin D metabolism is it must be metabolized in the kidneys to its active form, calcitriol.

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