May 31, 2017
Warning!! After 5 weeks my D3 level is 642.8 nmol/L or 257.5ng/mlBy Alexander Dennehy on 21 November 2014
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Warning!!! I have followed the advice in the book for about 5 weeks, I have been taking D3 50,000iu combined with 5,000mg of K2(super K) per day, for 5 weeks and have just a call from the NHS testing service saying that my D3 levels were dangerously high and what the hell was I doing to get them so high. I told them I had been supplementing with D3 they suggested I discontinue for at least 2-3 months and get my levels retested then. My level after 5 weeks was 642.8 nmol/L or 257.5ng/ml which is very high and potentially damaging to the kidneys.
So my advice is get tested before you start supplementing and get tested at least once a month if you are taking high doses.
After a year of taking D3 jeff got his level up to 168ng/ml which is surprising low to me considering how much he was taking, considering where mine where after 5 weeks, and I don’t get much sun at all.
Bottom line our bodies metabolise things differently, after a year of daily D3 doses Jeff ‘s max D3 levels were 168mg/ml and after only 5 weeks mine were 257.5ng/ml, If I would not have got tested and carried on taking 50,000iu a day for a year I would hate to think how high my reading would have been.Just be careful, too much of something can be as bad as too little. But as I told the lady from the NHS test centre I feel great, but that doesn’t mean I have not put myself at risk.
The NHS testing centre I used send out a testing kit and you draw blood and send it back to them in the post. A week later they give you the results.
You can order a testing kit from the website below.
http://www.cityassays.org.uk/Vitamin%20D%20Blood%20Spot.htmlHope this helps. ony Clifton 2 years ago (Edited) Wow that’s high! That’s great that you still feel ok….I did read in the book the advice was to test from time to time…and the author regrets not having started testing up front…From what I understand is that the d3 level is actually irrelevant because it is only the excess calcium in the blood caused by d3 remodeling your bones that can be dangerous if it lodges in your soft tissues insrtead of going back into your bones….So you should probably get a blood calcium test and if it is in the normal range..you probably have nothing to worry about…no matter how high your d3 level…I think the only way d3 can be harmful is if your blood calcium goes way up and it can then calcify your kidneys or cause kidney stones… I beleive the K2 is what makes taking high doses of d3 safer by charging up the hormone (osteocalcin?) that puts the calcium back into your bones…other signs of hypercalcemia are loss of appetite nausea weight loss…and one more thing I remember the author took 4000 a day for 10 years and then upped it to 25,000 a day for 3 months or so?? before trying those extreme doses..