Answer:
Not very long!
If you're B12 defective, you'd need to find a shot every week for a while, then once a month, next 3-4 times a year. But you'd have blood test to monitor your levels and your doctor would tolerate you know a proper schedule.
It usually last about a week..I return with my B-12 shot every Monday. I am not B-12 deficient, I if truth be told get it to heighten my vivacity level for a while.
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