Abstract Background: Vitamin B12 deficiency is a widespread condition, particularly among elderly individuals, patients with malabsorption syndromes, and those following plant-based diets
Common effects usually mild and often worst during titration include nausea, vomiting, diarrhea, constipation, abdominal pain, upset stomach, headache, and fatigue
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If you have trouble with absorption, Vitamin B12 shots are more effective because they bypass the digestive system
However, these findings should not be treated as guaranteed human weight-loss or anti-aging results