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B12 Intramuscular Dose Recommendations The usual dose for vitamin B12 injections is 1000 mcg (1 mg)
First, the effect is enzymatic and cumulative you are shifting a metabolic set-point over days and weeks, not triggering an acute hormonal event, which is why steady daily exposure matters more than any single large dose
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Individuals with Gut Absorption Issues : Conditions like Crohn's disease, celiac disease, or pernicious anemia (an autoimmune condition where the body can't produce intrinsic factor, a protein needed for B12 absorption) can significantly impair B12 uptake
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