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Doctors use B12 shots as a last resort, such as if a supplement isn't working or a B12 deficiency causing severe symptoms
When someone arrives with a significant deficiency, their stores are low, their red blood cells may be enlarged (macrocytosis), and, in longstanding cases, nerve function can be affected
Nausea is the primary side effect and is dose-dependent
Hufeldt, M
B12 injections are typically administered directly into the muscle, known as intramuscular injection
MOTS-c and exercise-induced physical decline Reynolds JC et al
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