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B12 vitamin shots are typically administered via intramuscular or subcutaneous injection, with the dosage and frequency tailored to individual requirements
Stomach acid is necessary for making Vitamin B12 available from food
Homocysteine accumulates in the blood when there is inadequate folate and/or vitamin B 12 for effective functioning of the methionine synthase enzyme (see Function)
How long does it take to see results with B12 injections
Allergic reactions to excipients (mannitol, bacteriostatic water preservatives) can mimic overdose symptoms and may require epinephrine
Although pernicious anemia, or Addison-Biermer disease, had been recognized clinically in the mid-19th century, the associated neurologic, gastrointestinal, and hematologic manifestations were not recognized clinically and linked with pernicious anemia until the end of the 19th century (139)
