b12 injection in deltoid Dosage and Frequency: 7 Guidelines for Adults How to inject B12 in

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While vitamin B12 injections have a strong safety profile, we recommend caution or avoidance in certain situations

First, the effect is enzymatic and cumulative you are shifting a metabolic set-point over days and weeks, not triggering an acute hormonal event, which is why steady daily exposure matters more than any single large dose

More importantly, body composition is shifting