What dose of Vitamin D3 to take?
Conversion of Vitamin D quantities:
25 ?g = 1,000 IU
500 ?g = 20,000 IU
?g = micrograms
mg = milligrams
Note that a milligram is 1,000 times more than a microgram and that many milligrams of Vitamin D are rarely prescribed !
The UK measures blood level of Vitamin D in nmol/L ( nanomols per Litre )
The US measures blood level of Vitamin D in ng/mL ( nanograms per milliliter )
Conversion: 1 ng/mL = 25 nmol/L
The half-life of Vitamin D in the body is about 30 days
This means that it is acceptable to take 7 times the daily dose once a week
So taking 50,000 IU once a week is equivalent to taking about 7,000 IU once a day
Toxicity may only start if you take more than 30,000 IU per day for 90 days
Dr Robert Heaney has said that it is OK for an adult to take 300,000 IU in a month
CAUTION:
If you have Thyroid problems or Sarcoidosis you should follow specific advice from your doctor, as you may be abnormally sensitive to Vitamin D.
Maybe start with a single dose of 1,000 IU and wait a week to see what happens
You can watch videos of 2 scientific talk about this:
Go to www.ucsd.tv and search for: Heaney
Dr Robert Heaney links all the evidence across many short-term and long-term illnesses
www.ucsd.tv/search-details.aspx?showID=18718
and explains how Vitamin D interacts with & enables uptake of calcium
www.ucsd.tv/search-details.aspx?showID=18713
There is more online at:
www.vitamindwiki.com Search by illness
www.vitamindcouncil.org General advice
www.grassrootshealth.net Search for the experts Call To Action
www.vitamindassociation.org Look for videos of scientific conferences
www.vitaminduk.com Occasional comments about UK specific matters
I gave a talk at Nutricentre that you can watch online at:
https://www.youtube.com/watch?v=4j6MurzRj08
Rufus Greenbaum
[email protected]
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