Patients on Metformin : Patients with type 2 diabetes treated with metformin may experience reduced vitamin B12 absorption
Wang, S.-H., Lin, L.-P., Lin, M.-S., Pang, J.-H
B12 shots for malabsorption or dietary restriction Vegans, vegetarians, older adults, and people with GI conditions (Crohn's disease, celiac disease, pernicious anemia) commonly have inadequate B12 absorption
Metabolomic analysis reveals metabolic disturbances in the prefrontal cortex of the lipopolysaccharide-induced mouse model of depression
Glutathione peroxidase, superoxide dismutase, and glutathione S-transferase activities [PMID: 6465684] Laboratory literature summary: Glutathione peroxidase, superoxide dismutase, and glutathione S-transferase activities in research subjects lung
Increasing the amount because a supplement does not create an immediate noticeable effect is not recommended