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Description
Starting doses are typically conservative so your body can adjust, and you are told exactly what is normal in the early days and what to report

B12 injections address a specific nutritional need with well-documented benefits for energy, neurological function, and overall vitality
Splitting into twice-daily injections is reasonable at higher daily totals (e.g., 250 mcg AM + 250 mcg PM at a 500 mcg/day total)

Annals of the New York Academy of Sciences 669: 720

So when you are getting a b12 shot, when should you expect it to work

Consistent timing helps establish steady-state levels