Re: An effective dx » Horse

Thank you for your post. It's really good that you seem to be responding to the vitamin D that you're taking. I think that I'm finally noticing what's probably a long-term response to the vitamin, as well. For a while, I wasn't sure that I was going to respond long term to the D3, but my energy and concentration seem to be getting slowly better, and I can't seem to attribute that to anything but the vitamin D3.

As far as whether continuing to take weekly megadoses of vitamin D might be harmful is concerned, I tend to think that there's always a possibility that exceeding the tolerable upper intake level of a vitamin, especially over an extended period of time, might involve some risks. For vitamin D, the Institute of Medicine's tolerable upper intake level is 4,000 IU/day for people for adults and children older than age eight, according to the National Institutes of Health. The NIH also states that although symptoms of vitamin D toxicity are unlikely to occur when taking less than 10,000 IU/day of the vitamin, exceeding the tolerable upper intake level over a long period of time increases the risk of adverse health effects, citing the dietary reference intakes developed by the Institute of Medicine's Food and Nutrition Board. Now, different experts recommend following different dosing guidelines for vitamin D. For example, the Vitamin D Council recommends that adults supplement with 5,000 IU of vitamin D a day, which you might notice is 1,000 IU higher than the Institute of Medicine's tolerable upper intake level. From my perspective, it can be hard to know which experts to believe or how great the risk of adverse health effects might be from taking more than 4,000 IU of vitamin D in the long run. Again, I would say that exceeding the tolerable upper intake level of vitamin D over an extended period of time might possibly involve some risks, but I'd recommend consulting with your doctor to get a good idea as to how risky supplementing with high doses of vitamin D over a long period of time might be and to weigh whether or not you should keep taking the high doses that you're taking.

Finally, concerning the vitamin B3 (niacin) that I take, to be honest, the only reason I'm still taking it is to avoid the unpleasant withdrawals that I've noticed every time I reduce my dose. For me, niacin seemed to help in the short run with my energy and concentration, but it doesn't seem to have any noticeable effects when I take it regularly, although I do notice what I'd describe as withdrawal symptoms when I reduce my dose. Maybe I'll try reducing my dose again soon, now that it seems like I'm possibly getting long-term benefits from the vitamin D3 that I'm taking. In other words, I'm hoping that the boost that I'm getting from the D3 might help to offset any withdrawal symptoms that I might get from reducing my niacin dose.

Well, feel free to let me know if you have any questions about what I've written. Take care for now, and stay well.

Has long-standing difficulties with energy and concentration, as well as psychotic and cognitive symptoms

Taking Abilify & supplements including vitamins B3 & D3

Re: An effective dx » Horse

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