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My over active imagination is conjuring up pictures of anaphylactic shocks, even though I have had the B12 injections from doctor before

Pernicious Anemia The most common cause of vitamin B12 deficiency is decreased or missing intrinsic factors

For patients whose levels fall in the borderline or gray zone, a methylmalonic acid (MMA) test provides greater specificity MMA levels rise when B12 is functionally inadequate at the cellular level, even if serum B12 appears borderline normal

This equates to approximately 0.73mcg/lb, or about 146mcg for an individual weighing 200lb

Unfortunately, your body does not produce it on its own