[MacMattico]

I am not a senior citizen, in good health and my doctor can not figure out why my Vitamin D level will not go up. I turned 40 and had a whole series of blood and other tests as a preventative measure because the insurance said they paid for it so why not? Everything was fine except the Vitamin D— he had hardly ever seen a level so low. I was put on a high dose of D3 and went back three different times over a year in a half with no change. I now am asked to take the same dose of D every 3 weeks. (It was a pill that you took once a month.) I don't feel any different than I did a year ago, and my only complaint was fatigue. Then again I'm up half the night or early on free republic so maybe I have myself to blame for that. :)

[Spartan79]

The body synthesizes vitamin d from cholesterol. I’ve read somewhere that some people have cholesterol levels so low that their body’s ability to produce vitamin d when exposed to sunlight can be significantly impaired. You don’t mention your cholesterol level in your comment, but if is very low, this issue might be worth exploring. We’ve all had “high cholesterol bad, low cholesterol good” drilled into our thoughts for so long that it’s easy to lose sight of the fact that cholesterol can be TOO low.

[Patriotic1]

50,000 IU?

[CutePuppy]

Instead of 50,000IU once a month you could try 10,000IU once or even twice a week (definitely check with your doctor on this regimen) with B12 (sublingual should suffice, use better absorbing methylcobalamin form instead of cyanocobalamin) and highly bioavailable form of magnesium supplement (your fatigue is a classic sign of insufficient B12 and magnesium - see post #97 on magnesium depletion while taking large doses of Vitamin D).

Definitely run this by your doctor, so he can monitor it.