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Although it's extremely rare it is known for some people to have an anaphylactic reaction to an injection
Pregnant and breastfeeding women: The requirement increases to 2.6 mcg per day
(Comprehensive review detailing the inter-related roles of B-complex vitamins in cellular metabolism, energy production, and neurological function)
In theory with ideal, healthy intestinal flora these bacteria will produce a portion of the required B12
Is the dose too high
The cause of malabsorption needs to be addressed by a health care professional in these cases
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