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Individuals with mild deficiencies or those looking to maintain optimal B12 levels

The concentrations in other tissues were lower than the average concentration in the plasma and are presented in the descending order as follows: intestinal tract, lung, gonad, skin, skeletal muscle, cardiac muscle, whole blood, brain, and body fat

Mthylation dans le cycle de la mthionine des phospholipides, protines, myline, catcholamines, cratine, carnitine, ADN, ARN

There are also injectable, nasal, and topical options

Deficiencies can occur with medical conditions such as atrophic gastritis (which causes thinning of the stomach lining), pernicious anaemia, Crohns disease, celiac disease, lupus, or other immune system disorders and certain medications