This type of injection is best administered in the upper arm
In practice, if a therapy is considered, success should be defined with measurable endpointssleep quality, function, waist circumference/body composition (when appropriate), and metabolic markersrather than vague claims alone
While oral B12 supplements are available, vitamin B12 injections have advantages including enhanced absorption since it bypasses digestion, a fast-acting energy boost from quick absorption, higher blood levels reached versus pills, lasting benefits between maintenance doses, improved concentration and mental clarity, and often more affordable and convenient long-term
Injection Site Reactions The injection site may become red, slightly swollen, or itchy, particularly if it is not rotated correctly
doi: 10.1016/S0140-6736(20)32649-0 30 YoshinoMKayserBDYoshinoJSteinRIReedsDEagonJCet al