giving vitamin b12 injections Shots: Do They Actually Work? Vitamin B12 shots: Uses, benefits,
Description
People with Absorption Issues If you have conditions like pernicious anemia or Crohns disease, you may need more frequent injections to compensate for poor absorption
Usually, 2 to 3 mg of vitamin B 12 reserves are stored in the body primarily in the liver, and our daily requirement of vitamin B 12 is only about 2 to 3 g

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In two trials employing 1000 g/day oral vitamin B 12 , there was no clinically relevant difference in vitamin B 12 levels when compared with IM vitamin B 12
