There is no upper limit for B12. The lab ranges often end around 800-900. But there is no recorded high being harmful anywhere in the literature for over 40 yrs! The FDA has not set an upper limit on B12 therefore. Most of us at PN keep ours above 1000. Dr. Snow who in 1999 changed B12 interventions and therapy has in his article, reasons for using B12 even if you are normal. He found relatively normal patients with neuro problems who improved with B12 supplements anyway irregardless of test results in the 400's or so.
There is NO evidence that high levels are dangerous.
Toxicity
Quote:
|
No toxic or adverse effects have been associated with large intakes of vitamin B12 from food or supplements in healthy people. Doses as high as 1 mg (1000 mcg) daily by mouth or 1 mg monthly by intramuscular (IM) injection have been used to treat pernicious anemia without significant side effects. When high doses of vitamin B12 are given orally, only a small percentage can be absorbed, which may explain the low toxicity. Because of the low toxicity of vitamin B12, no tolerable upper intake level (UL) was set by the Food and Nutrition Board in 1998 when the RDA was revised (6).
|
from
http://lpi.oregonstate.edu/infocente...ns/vitaminB12/
In fact lab ranges below 400 are still considered "normal" and are NOT. This is where the real problems reside.
My thread has medical sites for doctors on it early on, and also Dr. Snow's paper on post #70 later on. B12 is very misunderstood, and that need correcting for many patients today, esp if you are over 50 and even healthy!
People using drugs, acid lowering drugs, and some others, will develop B12 loss, and not even know it.
Quote:
Originally Posted by Nanc
Hey there!
I have low B-12, D and Potassium. I get monthly B-12 injections and when the level gets high, we skip months because too much is definitely not good for you! I take D drops and Potassium pills daily. At this moment my B-12 is at a good level so we are skipping a couple of months, I have never noticed when the levels are up there that it helps my RSD at all.
That is not saying that it might not work for you. If you do choose to take any supplements, especially vitamin B, you need to do so under medical supervision because levels that are too high can be dangerous as well.
All the best,
Nanc
|
__________________
All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
************************************
.
Weezie looking at petunias 8.25.2017
****************************
These forums are for mutual support and information sharing only. The forums are not a substitute for medical advice, diagnosis or treatment provided by a qualified health care provider. Always consult your doctor before trying anything you read here.