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Adequate B12 levels can promote better sleep quality by regulating sleep cycles

However, too much of a good thing, even histamine, can cause problems

A list of common conditions besides pernicious anemia associated with a B12 deficiency includes the following: Crohns disease Celiac disease Atrophic gastritis, otherwise known as a thinning of the stomach lining Bacteria or parasites in the intestines Immune system disorders, including Graves disease and lupus Inflammatory bowel disease (IBD) Medications Medications can also interfere with B12 absorption, such as some heartburn medicines and proton pump inhibitors prescribed to diabetics

Some studies also suggest that thiamine can alleviate symptoms of abdominal pain, nausea, vomiting, and anorexia (30, 31)