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Kidney disease or renal insufficiency, where amino acid overload may pose a risk
Cyanocobalamin vs
Methionine is an amino acid that acts as a lipotropic agent
[4] Why Vitamin B12 Can Cause Gastrointestinal Symptoms The mechanisms underlying gastrointestinal side effects from vitamin B12 supplementation are not fully established, but several factors may contribute to stomach discomfort in susceptible individuals
Typical descriptions: "Day 3 was when I really noticed," "By Thursday (injected Monday) I felt like a different person." Days 4-7: Plateau phase
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