are there side effects from b12 injections Vitamin B12: Overdose and Common Side Effects From Vitamin

Vitamin B12 deficiency often leads to nervous system damage that damages the optic nerve leading to your eyes

Summary: Feeling worse after a B12 injection typically reflects your body adjusting to replenished vitamin levels, triggering metabolic processes that may temporarily cause fatigue, headaches, or injection site discomfort

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Don't forget to consult your healthcare provider to determine if B12 injections are appropriate for you and to discuss the optimal dosage and frequency tailored to your individual needs