b12 injection is what drug class Vitamin Injection: Energy Boost and Anemia Treatment — Mountainside Medical 8 Common Injections 💉 and

Together, they support vital body functions, helping reduce the risk of vitamin D deficiency, cognitive impairment, and fatigue especially in older adults, who are more vulnerable to low levels of these nutrients

10.1016/j.orcp.2021.02.002 45 RothM.OrijaI

Supports immune function Helps the body defend against illness and stress

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This is a commonly referenced study from 1963 claiming a half-life of 5-6 days: nature.com/articles/198200a0 Although I would not cite it as an authority, the six-day half-life has also made it onto the B12 page in Wikipedia, seemingly unchallenged