does vitamin b12 injection cause red urine Pernicious Anemia: Definition, Symptoms, Causes & Treatment What Color is Vitamin B12
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Am J Clin Nutr 2013;98:123340

As a result, platelet counts can fall rapidly, sometimes within a few days

Early changes are often about energy and adherence, with body-composition changes building more gradually
Anaphylactic shock and death have been reported after parenteral vitamin B 12administration

I do not think anyone can give you really good advice