Written by Jimmy Down
“The daily allowance of vitamin D recommended by Institutes of Health is ridiculously lower as some vitamin D experts commented. Â Canadian Cancer Society recommends daily intake of vitamin D should be 1000 IU per day. Â Â The US recommends a much lower dose than the Canadian government does.
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The authority of the U.S. recommendation has been challenged because none of the more than a dozen of ‘experts’ in the committee that proposed the recommendation are among most famous vitamin D researchers. Â And the comment submitted to the committee from vitamin D experts including some distinguished vitamin D investigators has not been released to the public, according to vitamin D researcher Dr. John Cannell, who runs Vitamin D Council.
So exactly how much vitamin D in the form of supplements does an adult need to take to maintain a normal serum level of vitamin D?
World famous vitamin D researcher Reinhold Vieth of University of Toronto in Canada published a report in Scandinavian Journal of Clinical & Laboratory Investigation saying that the low end of the desirable concentration of serum vitamin D should range from 50 nmol/L to 75 nmol/L, based on clinical trials and epidemiological studies.
Based on clinical trials, the high end of the safe serum concentration for 25(OH)D is about 225 nmol/L. Â Dr. Vieth says a person who is not exposed to the sun or sunshine, this 225 nmol/L can be achieved with prolonged consumption of about 10,000 International Units (IU) of vitamin D3 per day or 250 ug per day.
It is generally accepted that 10,000 IU of vitamin D can be achieved by exposure of the face and hands without using sunscreens to the sun at the hottest hours of the day for 15 to 20 minutes. Â This level is generally considered safe. Â Sunscreens can shield sunshine leading to vitamin D deficiency.
Dr. Viet says in his report ‘Government policy is very conservative, and consequently, the latest advice from the Institute of Medicine for Canada and the USA specifies that in the absence of sunshine, a recommended dietary allowance (RDA) of 600 IU/day (15 μg/day) of vitamin D will provide a serum 25(OH)D concentration of at least 50 nmol/L.’
He also says ‘Dietary-vitamin D-intake statistics for adult populations show that average intakes from food and supplements are 200–400 IU/day (5–10 μg/day), respectively. Therefore, adult populations are consuming vitamin D in amounts far below the RDA. Even if adults were to consume the RDA for vitamin D, it would still not be enough to ensure 25(OH)D > 50 nmol/L.’
Vitamin D deficiency has been associated with more than 100 health conditions including heart disease, cancer, metabolic syndrome, diabetes mellitus, infectious disease, depression, mental disorders, and others.
For those who want to take vitamin D supplements to fight or prevent cancer, they must use high doses.  According to Dr. Cannell, a low serum level of vitamin D will not send  any calcitriol, an active form of vitamin D, to the issue where the fighting of cancer needs to occur.”