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In rare therapeutic cases, they may contribute to rapid weight changes, but not commonly in regular dosing
The following groups of people are at a greater risk of developing a vitamin B12 deficiency: Vegans or vegetarians People 75+ years Having a digestive system disorder like Crohns or celiac disease Drinking excessive amounts of alcohol Having Sjgrens syndrome Taking certain medications like oral birth control or metformin Common symptoms of a vitamin deficiency include fatigue, numbness, poor balance, memory loss, and breathlessness
National Center for Biotechnology Information
Healthy B12 levels can be sustained with monthly supplementation
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