A 37-year-old member asked:
how long does it take a vitamin b12 injection to take effect?
1 doctor answer
Dr. Joel Gallant answered
35 years experience Infectious Disease
Take effect?: I'm not sure what you mean by 'take effect.' the only indication for vitamin B12 injection is for people with severe B12 deficiency or those who are unable to absorb B12 from their diet. That applies to very few people. If you're being given B12 injections for 'energy, ' you should be aware that's it's a commonly administered placebo.
Answered on Oct 29, 2018
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