Post-bariatric surgery patients Surgical alteration of the stomach or small intestine reduces the absorptive surface area for B12
Animal-based foods contain the highest amount of vitamin B12, this is why vegans and vegetarians are often at risk of developing a deficiency
Vitamin B12 is a water-soluble vitamin, meaning the body excretes any excess through urine rather than storing it
Haemmerle G, Zimmermann R, Hayn M, Theussl C, Waeg G, Wagner E, Sattler W, Magin TM, Wagner EF, Zechner R
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