Apostolopoulos, Vitamin B1, B2, B3, B5, and B6 and the Immune System, in Nutrition and Immunity, Cham: Springer International Publishing, 2019, pp
Factors Affecting Dosage Requirements Many things can change how much B12 someone needs
Likewise, autoimmune conditions that affect the stomach lining, such as atrophic gastritis or pernicious anemia, directly impact intrinsic factora protein essential for B12 absorption
This peptide regulates the levels of hormones involved in the metabolic pathways such as insulin and glucagon
Many foods are fortified with artificial vitamin B12, such as non-dairy milks and cereals, but these are not always optimally absorbed, so vegans must still be proactive about making sure they are not becoming deficient
Rates of deficiency increase with age