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Atrophic gastritis , often associated with Helicobacter pylori infection or autoimmunity, reduces gastric acid secretion necessary for releasing food-bound B12
Those who are more likely to have low iron include people who: Have heavy periods Are pregnant or breastfeeding Are infants (especially if they were born premature or low birth weight) Are frequent blood donors Have cancer, certain digestive diseases, or heart failure Are on kidney dialysis Have trouble absorbing iron because they: Have a digestive condition such as celiac disease, ulcerative colitis, Crohn's disease, or Helicobacter pylori infection Had weight loss surgery What happens if you don't get enough iron
Sublingual B12 bypasses intestinal absorption issues and potential barriers caused by genetic variants, which makes it a more accessible treatment option for vitamin B12 deficiency
This systemic effect may explain why users sometimes report benefits beyond the specific area being treated
