B12 from injections lasts about 72 hrs from humans.
From a 1000mcg injection, one study found 150mcg was
typically absorbed.
http://www.ncbi.nlm.nih.gov/pmc/arti...able/T1/#TF1-4
B12 has no upper limit of toxicity set by the FDA. Some people receive daily shots, for a while, until they normalize, in fact.
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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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