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The role of acid-labile subunit (ALS) in the modulation of GH-IGF-I action

Vitamin B12 is an essential nutrient that plays a critical role in the production of red blood cells, the maintenance of the nervous system and DNA synthesis

You cannot overdose on vitamin B12

The even better news: side effects from vitamin B12 supplements are usually mild, says Richard Foxx, M.D., a board-certified physician who treats hormonal disorders and nutritional deficiencies

However, the energy boost may only work in deficient people or those with certain health conditions

If reticulocytes have not increased after treatment or if reticulocyte counts do not continue at least twice normal as long as the hematocrit is less than 35%, diagnosis or treatment should be reevaluated