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Research indicates that both intramuscular and high-dose oral vitamin B12 are effective in normalizing serum levels and improving clinical outcomes

agent or composition administered may be dependent on a variety of factors, including the sex, age, and weight of the subject being treated, the severity of the affliction, the manner of administration, and the judgment of the prescribing physician

Regul Pept (2004) 121:99105

Individuals with vitamin B12 deficiency Those following vegetarian or vegan diets Individuals with malabsorption issues, like Crohns disease or celiac disease Individuals experiencing chronic fatigue By increasing B12 levels, vitamin injections provide a steady energy boost without the crashes associated with caffeine or sugary energy drinks

Most research involves animal studies, and the Phase 1 human trial completed in 2015 never published results