b12 injection is what drug class Vitamin Injection: Energy Boost and Anemia Treatment — Mountainside Medical Vitamin B Complex: Package Insert

10.1016/j.orcp.2021.02.002 45 RothM.OrijaI

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

B12 offers benefits such as: reduced risk of heart disease reduced risk of stroke reduced risk of vision loss supporting neurological function healthy cell growth, repair, and reproduction mood regulation healthy digestion A person who eats meat, fish, or dairy usually gets enough B12 from their diet

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

Supports immune function Helps the body defend against illness and stress