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In the complementary medicine realm B12 is probably one of the safest things you could take
Side effects such as nausea, constipation, acid reflux, stomach pain, vomiting, diarrhea, and injection site reactions are common
Appointments have actually been a pleasant experience. - C
[4] In case of accidental large overdose (e.g., someone receives far more frequent injections than prescribed), monitoring for symptoms like flushing, tingling in extremities, or liver enzyme elevations would be prudent
1 2 3 "Contributions of microbes in vertebrate gastrointestinal tract to production and conservation of nutrients"
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