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You may lack vitamin B12 if you dont get enough of this micronutrient in your diet or if you have a digestive system disorder that prevents proper B12 absorption
Those with Lebers disease (a hereditary eye condition) should also avoid B12 as it may worsen the condition
Brain 14 , 4 (2021)
Adults usually get 1000 mcg (1 mg) of Vitamin B12 through injections
Methylmalonic Acid Levels among Older Adults Older adults appear to have higher average MMA levels without apparent consequence
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