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[18] Some proponents claim B12 injections enhance metabolism and promote fat loss by increasing energy levels, thereby encouraging greater physical activity and caloric expenditure
Vitamin B12 injections are also used by people with impaired vitamin B12 absorption or deficiency called Pernicious anaemia caused by: Inadequate dietary intake of B12 Loss of gastric parietal cells in chronic atrophic gastritis Structural damage or surgical resection of the small intestine or stomach Long-term use of acid regulating medication Alcoholism Gastric banding surgery Celiacs disease Pernicious anaemia Crohns disease Until now, injection of methyl-B12 has required a needle
Understanding potential adverse effects enables informed decision-making and appropriate medical monitoring
That idea is an extrapolation from rat data
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Journal of Endocrinology and Metabolism, 3(12), 715
