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B12 supplementation is generally regarded as safe and unlikely to cause harm to most people as there is no risk of overdose
It may cause symptoms related to neurological failure like loss of feeling or sensation, irregular bowel movements, sleep disorder, getting irritated, feeling depressed, memory loss, Alzheimer's disease
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There is no robust clinical evidence that B12 injections enhance energy, alertness, or performance in individuals whose B12 levels are already adequate
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