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PMID 22661206
Preventing Deficiency Symptoms: Consistent B12 supplementation helps prevent the recurrence of deficiency symptoms such as fatigue, mood swings, and cognitive difficulties
Methylcobalamin and adenosylcobalamin are already in active forms, which some practitioners prefer for people with genetic variations that affect B12 metabolism
A doctor may look for autoimmune causes such as pernicious anemia, review medication effects, or check for digestive disorders that reduce absorption
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