Abdominal or stomach pain difficulty breathing swelling of your face, lips, tongue, or throat Diarrhea While there is some side effect of gaining weight but with its lack of quality research, B12 shots are being offered at some clinics for a weight-loss program that provides more energy and boosts metabolism, helping shed unwanted pounds
Addressing Common Absorption Barriers Things like stomach problems, some meds, and getting older can make it hard to absorb vitamin B12
It can cause joint pain, muscle pain, back pain, and fatigue
None of these pathways directly substitute for another, which is part of why researchers interested in a fuller picture of metabolic regulation may look at all three within the same body of literature not to combine effects, but to understand how separate systems might interact at a mechanistic level
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