Oh, I think 5000mcg is plenty for most people, if they are careful and take it on an empty stomach.
If you are absorbing it, it should show a large increase in blood work after 3 months or so. If it does not, something is wrong.
I tested at the end of the range from a hospital lab, after 3months on 5mg a day, oral. So now I cut back to 2 or 3 times a week instead. (1999 level).
Keep in mind that B12 is not the only thing to try. It is just the main/most common deficiency that is hidden for most people with neurological problems.
People with DNA errors in methylation, will require methylfolate as well instead of folic acid.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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