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SAM and methyl-donor pools laboratory work has tracked changes in cellular SAM, SAH and 1-methylnicotinamide levels following NNMT inhibition

Other conditions that make Vitamin B12 absorption more difficult are: Weight loss surgery or another operation that removed part of your stomach Heavy drinking Taking acid-reducing medication for a long time Certain health issues may also lead to the development of vitamin B12 deficiency such as atrophic gastritis, pernicious anemia, Crohns disease, celiac disease, immune system disorders, Graves disease and lupus

If symptoms persist, talk to your health professional

doi: 10.1016/S0140-6736(07)60033-6