where do b12 injections go How to Self-Inject Vitamin at Home Vitamin B12 Injections
Description
As a result, the body can quickly access and utilise vitamin B12, and individuals may experience rapid improvements in symptoms associated with deficiency, such as fatigue, weakness, and neurological symptoms
PLoS ONE 6 , e22781 (2011)

Vitamin injections generally begin to work immediately, but noticeable results vary from person to person

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Wait 2-3 hours for blood flow to normalize