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Summary of the findings The current article evaluated 13 studies, of which eight were randomized clinical trials comparing different administration routes of vitamin B12 in patients with vitamin B12 deficiency

Early signs include tingling or 'pins and needles' in the feet and hands, numbness in the extremities, burning pain (often worse at night), balance problems, and muscle weakness

Several factors can influence how quickly youll experience benefits: Initial B12 Levels Those with severe deficiencies may notice more dramatic and rapid improvements compared to those with mild deficiencies

Journal of Aging Science , 4, 166