whats in a vitamin b12 injection The Science Behind B12: Why Do You Need It? B12 Shots vs. IV Infusions:

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Some people feel more energetic within a few hours to a few days after receiving the injection

Two separate human clinical trials (ulcerative colitis and multiple sclerosis) proceeded without significant adverse event reporting

It is also sometimes used off-label to help improve sleep patterns, circadian rhythm disorders, and to enhance cognitive functions, although more research is needed to fully understand the scope and efficacy of these uses