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Improved metabolism : Your body needs B12 to break down food and turn it into energy
A one-unit measurement error at that scale means you are off by 10%
No source presents a clinically validated injectable dose
People with GI conditions (such as chronic diarrhea, celiac disease, Crohn's disease, and ulcerative colitis) or who have had procedures like gastric bypass surgery that impair nutrient absorption are also at greater risk
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