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B12 is involved in metabolism and energy production, so if a deficiency is contributing to low energy and making it hard to exercise, injections might indirectly support weight loss efforts by boosting energy
Haemmerle G, Zimmermann R, Hayn M, Theussl C, Waeg G, Wagner E, Sattler W, Magin TM, Wagner EF, Zechner R
Brakedal B, et al
Post-bariatric surgery patients Surgical alteration of the stomach or small intestine reduces the absorptive surface area for B12
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