Thursday, December 16, 2010

Is Vitamin D Safe? It Still Depends on Vitamins A and K! Human Study and Testimonials

by Chris Masterjohn

New blog over at

Is Vitamin D Safe?  Still Depends on Vitamins A and K!  Human Study and Testimonials

Read more about the author, Chris Masterjohn, PhD, here.


  1. For K: 50 grams of Natto (a shot glass full) has 42 mcg Mk8 and 500 mcg of Mk7. These are the more long acting forms of K in the body.

    In Japan Natto is sold in 40 gram pre-packaged units. The nation health study set a safe daily maximum consumption from all forms of soy bean with a formula. Years ago I crunched the numbers for a slim 5+ foot tall woman and got +/- 39 grams of soy bean substrate.

    Home made Natto is a forgiving culture for the novice. "Nattomoto" innoculant spores can be bought cheaply.

  2. If vitamin D increases your need for vitamin A, the reversed scenario must also e true, or what?
    Vitamin A increases your need for vitamin D?
    This would somehow explain my reaction to vitamin A. Whenever I have tried to supplement with vitamin A, I get extremely dry eyes and dry skin that gets thin and breaks easily. When I stop it goes away. On my lab test it shows I am relatively low in vitamin D.
    Would this mean I would benefit from ONLY supplementing on D3 and possibly K?

  3. My wife has low vitamin D, 15 ng/ml, but can not tolerate fatty fish or cod liver oil. Earlier this year a doctor prescribed a vitamin supplement, 50,000 IU per week, which she assured us was vitamin D3. We are aware that some researchers, such as Dr. Vieth, have concluded that vitamin D2, or ergocalciferol, should not be regarded as a nutrient suitable for supplementation.

    My wife took two of the pills about ten days apart but suffered side effects of abdominal pain and anxiety so she took no more of them. Shortly thereafter a serum vitamin D test indicated total vitamin D of 32 ng/ml, of which 18 ng/ml was D3 and 14 ng/ml was D2.
    We were puzzled by the D2. We looked at the patient information that came with the prescription and found that it was called "Drisdol Maximum D3." and nothing in the voluminous information indicated that it was not vitamin D3. From internet search we determined that "Drisdol Maximum D3" is actually ergocalciferol, or vitamin D2!
    I called the pharmacy that supplied the D2 and was told that, yes, the Dr. had prescribed vitamin D3 but in amounts that was only available as vitamin D2. The pharmacist said this happens frequently and that they always call the doctor and get approval to give vitamin D2. They do not notify the patient, though.
    It surprises me, though not very much, that the FDA would allow such deceptive practice.
    We eat liver once a week so I do not think that low vitamin A is the problem. My wife tried vitamin D3 made from non-fish oil sources with no success. Currently she is just working on getting a good bit of sun, which can work as We live on the gulf coast.


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