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B12 shots are usually given into a muscle, like your upper arm or thigh

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"Paradoxical Vitamin B12 Deficiency: Normal to Elevated Serum B12, With Metabolic Vitamin B12 Deficiency"

. Doctors may not be prescribing oral vitamin B12 formulations because they may be unaware of this option or have concerns regarding its effectiveness Objectives: To assess the effects of oral vitamin B 12 versus intramuscular vitamin B 12 for vitamin B 12 deficiency. Selection criteria: Randomized controlled trials (RCTs) comparing the effect of oral versus IM vitamin B 12 for vitamin B 12 deficiency