Maintain your Vitamin D level
between 100 – 150 nmol/L
Vitamin D Health Benefits
Natural Levels of Vitamin D
Key Resources


Frequent sunscreen use may lead to vitamin D deficiency: study
Jul 17, 2017

A study among women in their 20s who use sunscreen more than three times a week has found they may have a deficiency of vitamin D in their blood.

The study was carried out by a team of researchers including those from Osaka Shoin Women's University. The team surveyed the frequency of sunscreen use and eating habits of a total of 101 women including students at the university starting in May 2016 for a period of one year.

The results showed that the average blood concentration of vitamin D for the women who used sunscreen at least three times per week fell below the standard set by the Ministry of Health, Labor and Welfare -- 20 nanograms per milliliter of blood -- throughout the year. These women were therefore considered deficient in vitamin D. It was also found that the concentration of vitamin D in their blood was a great deal lower than that of women in the 1980s.

full story . . .
Insufficient levels of vitamin D in pregnancy detrimental to child development
Jul 13, 2017

Vitamin D deficiency in expectant mothers during pregnancy has a negative effect on the social development and motor skills of pre-school age children, a new study in the British Journal of Nutrition reports.

Examining data gathered from over 7,000 mother-child pairs, researchers from the University of Surrey, and the University of Bristol, discovered that pregnant women who were deficient in vitamin D (less than 50 nmol per litre in blood) were more likely to have children with low scores (bottom 25 percent) in pre-school development tests for gross and fine motor development at age 2½ years than children of vitamin D sufficient mothers. Tests included assessments of their coordination, such as kicking a ball, balancing and jumping and their usage of fine muscles, including holding a pencil and building a tower with bricks.

Vitamin D insufficiency in pregnancy was also found to affect a child's at age 3½ years. However, no associations were found between maternal vitamin D status and other outcomes at older ages (IQ and reading ability at 7 to 9 years old).

full story . . .
Vitamin D Council addresses media claims of the dangers regarding increased vitamin D supplementation in recent years
Jul 12, 2017

A new paper, Trends in Use of High-Dose Vitamin D Supplements Exceeding 1000 or 4000 International Units Daily, 1999-2014, published by JAMA, has been making its way through all media platforms, casting a shadow over vitamin D supplementation. The Vitamin D Council exists to provide clarity on research regarding vitamin D. So, when findings become misinterpreted by the media and begin causing mass confusion, it is our duty to intervene.

First, let’s try and understand just what this paper is about, and what the results might mean for vitamin D. The media portrays this paper as evidence proving that doses of vitamin D higher than the Food and Nutrition Board’s recommended dietary allowance (RDA) and upper limit (UL) are dangerous. However, the research conducted in this paper provided no such evidence that vitamin D doses higher than the RDA is dangerous, only that the trends in supplementation are changing.

Researchers from this study used data from the National Health and Nutrition Examination Survey (NHANES) to determine the trends in vitamin D supplementation from 1999-2014. To be more specific, they were trying to determine the prevalence of individuals supplementing with either 1,000 IU of vitamin D or more, or with 4,000 IU D3 or more. The researchers excluded individuals who were pregnant, under the age of 20 or who did not provide adequate information on their supplementation routine. Participants were required to report their daily supplemental vitamin D intake over the last 30 days. The researchers collected the data on the 39,243 individuals who reported their vitamin D intake.

full story . . .
Vitamin D guidelines need to be updated – here’s why
Jul 06, 2017

Most people know that it’s important to get enough vitamin D. Among other things, it’s vital for bone and muscle health. What people may not know is that there are two types of vitamin D: vitamin D2 (found in plant-based foods) and vitamin D3 (found in meat and fish).

The public haven’t had to worry about this distinction because nutritional scientists have been telling us for years that both forms of the vitamin are “biologically equivalent”. In other words, a given dose of vitamin D2 or D3 will raise blood levels of vitamin D by the same amount. However, our latest study shows that this is not the case.

We have discovered that, compared with vitamin D2, vitamin D3 is twice as effective at raising levels of the vitamin in the body, when given at recommended daily doses. This finding means that a lot of health guidelines will need to be rewritten as many claim that the two forms of vitamin D are equivalent.

full story . . .
Vitamin D clue to MS immune response
Jun 29, 2017

VITAMIN D may help repair damaged brain tissue in patients with multiple sclerosis by interacting with the white blood cells responsible for dampening down the body's immune response, according to research due to be presented in Edinburgh today [thu].

 It has long been observed that rates of MS increase the further populations are from the equator, as the decline in exposure to sunlight also hampers the body's ability to generate vitamin D. Scotland and Canada have the highest prevalence of MS worldwide, but so far scientists have been unable to prove a cause-and-effect link between vitamin D deficiency and MS.

 However, research due to be presented on the opening day of the MS Frontiers conference suggests that the vitamin appears to play a role in guiding white blood cells, known as T cells, towards the brain. The study uses zebrafish which have had one side of their brain damaged to mimic MS. The fish - which are transparent - are then immersed in water enriched with vitamin D. The T cells in their bodies have also been engineered to glow fluorescent green so that the researchers can observe their movement under a microscope and determine whether they migrate towards the damaged side of the brain.

full story . . .
Could your office job rob you of vitamin D?
Jun 23, 2017

(HealthDay)—Spending your days cooped up inside an office might mean you're not getting enough vital vitamin D—know as the "sunshine vitamin," researchers report.

Canadian researchers found that D deficiency levels differ by occupation, with people who are closeted indoors faring worse than others.

"We know that vitamin D deficiency and insufficiency is prevalent in the population at large. We can now say that occupation is a factor that is important in determining if someone may be vitamin D-deficient or not," said lead researcher Dr. Sebastian Straube. He's an associate professor of preventive medicine at the University of Alberta in Edmonton.

Vitamin D is found naturally in a few foods, and often added to milk and other products. Skin exposure to sunlight also produces vitamin D, which is why it's called the sunshine vitamin.

In the new research, Straube and his colleagues reviewed 71 previously published studies that included more than 53,400 people in the northern and southern hemispheres.

full story . . .
Joint International Symposia
Jun 21, 2017        

Vitamin D in Prevention and Therapy (June 21-22, 2017)


Biologic Effects of Light (June 22-23, 2017)

 Schlossberg Hotel Homburg, Germany

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Sep 22, 2017        8:00am

Medius Corporation is delighted to welcome you to the




September 22-23, 2017 | Warsaw

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Are People Really Taking Sky-High Doses of Vitamin D?
Jul 11, 2017

By Perry Holman, Executive Director, Vitamin D Society

A new study1 recently reported trends in vitamin D supplementation in the USA from 1999 to 2014. It found that that vitamin D supplement use of ≥1000 IU or more per day increased from 0.3% in 1999 to 18.2% in 2014. Also vitamin D supplement use of ≥4000 IU per day increased from 0.2% in 2007 to 3.2% in 2014.

The researchers made this key point in their discussion:

“Overall, 3% of the population exceeded the tolerable upper limit of 4000 IU daily, and may be at risk of adverse effects as a consequence”

But how many people were really supplementing over 4000 IU/d? If they were just taking 4000 IU/d there would be no risk as this is the safe upper limit and does not require doctor supervision.

full post . . .
Why Sunshine is good for you and the best source for Vitamin D!
May 12, 2017

We interviewed Dr. Michael Holick on why sunshine is good for you and the best source for vitamin D. Here is what he said:

In your opinion what is the root cause of vitamin D deficiency?

The 2 major reasons for the global D deficiency epidemic are the lack of understanding that very few foods naturally contain vitamin D and that sunlight has been and continues to be a major source for vitamin D worldwide.  The recommendation by many health organizations that neither children or adults should be exposed to direct sunlight has been a major factor in causing this pandemic.

Do you think the risks of moderate, regular sun exposure, such as skin cancer, has been over emphasized to the public?

There is no question that the abstinence message from national and international health organizations regarding sun exposure has been a major contributor to the vitamin D deficiency pandemic.  A recent study has suggested that moderate regular sun exposure does improve a person's vitamin D status and that mechanisms are at play in the skin to reduce the damaging effects from moderate regular sun exposure.


full post . . .
Does the Sunshine Vitamin Really Work?
Apr 13, 2017

By Perry Holman, Executive Director, Vitamin D Society

Based on recent media reports you may be questioning or doubting if vitamin D really works. Does it really prevent cancer?

You may have seen these headlines:

High Doses of Vitamin D Fail to Cut Cancer Risk

Vitamin D pills may not protect against cancer after all

These were based on a new study published in JAMA by Lappe et al. It was a randomized controlled trial of 2,303 women which studied the effects of 2,000 IU/d of vitamin D3 and 1500 mg/d of calcium supplement vs placebo on cancer outcomes.

But it did reduce cancer. A new diagnosis of cancer was confirmed in 109 participants, 45 (3.89%) in the Vitamin D and calcium group and 64 (5.58%) in the placebo group. Tell me which group you would want to be in? I think that this is a great result and proves that vitamin D could help prevent cancer.

full post . . .

Susan Rex Ryan
Defend Your Life

Defend Your Life has three main sections. The first addresses the fundamentals of vitamin D3 and its awesome benefits as well as minimal risk. The second highlights select diseases and conditions about which vitamin D3 may offer protection. The third includes the author's personal vitamin D3 story, including her theory about adequate vitamin D3 levels and how you can 'Defend Your Life'.

Reading this book will help you understand how adequate amounts of vitamin D3 are essential to enhancing your quality of life.

Ian Wishart
Vitamin D: Is This the Miracle Vitamin?

In this compelling new book,award-winning investigative journalist and bestselling author Ian Wishart brings together the most up to date science on vitamin D and how it could well save your life. Cancer? Up to a 77% reduction in risk of developing it if you take this vitamin. Heart disease? The same kind of reduction. Did you know that autism, mental illness and multiple sclerosis all appear to be caused by a lack of vitamin D during pregnancy?

The lives of every single person, including you, will be affected by the information in this book. With more than 300 scientific trials and studies cited, this book is a reference guide not just for the general reader but for medical professionals alike.

 more books...


Summer Smart Sunshine Tips to Boost Vitamin D Levels

For Immediate Distribution

TORONTO, Ont (April 4, 2017) – The daylight hours are getting longer, the sun is getting stronger and summer is just around the corner. Make this the year that you optimize your vitamin D levels through effective sun exposure. Enjoy the health benefits and disease prevention from optimal vitamin D levels and learn to control your risks from sun exposure.

Vitamin D is made naturally in your body when UVB rays from the sun convert cholesterol in your skin to pre-vitamin D3. We make about 90% of our vitamin D from UVB sun exposure. UVB rays are short and only reach the earth when the sun is directly above us. We can’t make vitamin D in the winter in Canada because the sun is at too low of an angle and the UVB rays are absorbed in the atmosphere.

You make vitamin D in Canada between the months of May and October. The best time for exposure is around midday, between 10am and 2pm, when the UV index is above 3 and your shadow is shorter than your height. The further you get from noon, the lower the amount of vitamin D you’ll make. The sun’s visible light may penetrate through glass, but UVB light will not therefore you will not make vitamin D.

full press release

Study finds Vitamin D effective for reducing flu and colds

For Immediate Distribution

TORONTO, Ont (March 1, 2017) – People who boost their vitamin D levels with supplements reduce their risk of respiratory tract infections, such as the flu, by up to 12%, according to a new systematic review and meta-analysis study of 25 randomised controlled trial (RCT) studies published recently in the British Medical Journal (BMJ).

The study reported that this equates to one person being spared a respiratory tract infection (RTI) for every 33 taking vitamin D supplements. The benefit is greater in those receiving daily or weekly vitamin D versus bolus or monthly dosing, with the number needed to treat dropping to 20. The impact in Canada, based on a population of 35 million people, shows vitamin D could spare 1.75 million people having one RTI per year.

full press release

New Canadian study provides strong evidence that low vitamin D levels cause Alzheimer’s Disease

For Immediate Distribution

TORONTO, Ont (January 18, 2017) – A new scientific study published in Neurology from researchers at McGill University has provided evidence to support vitamin D as a causal risk factor for Alzheimer’s disease (AD). The McGill study found that lower vitamin D levels increased the risk of Alzheimer’s disease by 25% using a Mendelian randomization (MR) methodology which minimizes bias due to confounding or reverse causation.

Alzheimer’s disease is expected to double throughout the world in the next 20 years. The Alzheimer Society of Canada estimates that approximately 747,000 Canadians are living with some form of dementia.

There is no treatment that can effectively stop the progression of Alzheimer’s disease despite considerable effort. Therefore, disease prevention through modifiable risk factors where possible is critical. Ensuring vitamin D sufficiency through increased non-burning sun exposure in summer or vitamin D supplementation may be a cost-effective approach to help reduce Alzheimer’s disease risk.

full press release
Dr. Reinhold Vieth

Professor, University of Toronto, Departments of Nutritional Sciences and Laboratory Medicine and Pathobiology.

Click to View Dr. Michael Holick, Ph.D., M.D.

Professor of Medicine, Physiology and Biophysics; Director of the General Clinical Research Unit; and Director of the Bone Health Care Clinic and the Director of the Heliotherapy, Light, and Skin Research Center at Boston University Medical Center.

Click to View Dr. Cedric Garland, DrPH

Professor Emeritus in the Department of Family Medicine and Public Health at the University of California, San Diego.

 more advisors...

Converter Tool

In Canada Vitamin D 25(OH)D levels are measured in nmol/L. In the U.S. it is measured as ng/ml. To convert:

Enter nmol/L: ng/ml
Enter ng/ml: nmol/L