The following three-test approach, described by Carmel (2008, Annual Review of Nutrition), gives a more complete picture: Serum B12
For patients with impaired liver function or genetic variants affecting B12 metabolism, methylcobalamin may be preferable
If they respond to oral supplements, I would re-test after 1 year: if levels higher, continue supplements for life at which point, there is the debate between expensive tablets or risky injections
Mice with reduced adipose NNMT, when fed high-fat diets, gained less weight than control mice a striking adipose-specific effect
Two things need to happen for your body to absorb vitamin B12 from the food you eat: Your digestive system can then absorb B12
Brain Health and Cognitive Function: Vitamin B12 is known for its impact on cognitive function and neurological health