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Owing to the extremely efficient enterohepatic circulation of B 12 , the liver can store 3 to 5 years' worth of vitamin B 12
They usually last 30 minutes to an hour
Cautions : DO NOT TAKE large doses of vitamins (megadoses or megavitamin therapy) unless directed to by your doctor
Immune System : Vitamin B12 injections may impact the immune system, particularly in individuals with weakened immune systems
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