Vitamin B12 deficiency is strongly associated with cognitive impairment, including problems with memory, attention, and executive function, and is considered a reversible cause of dementia when caught early. Low or borderline B12 levels are more common in older adults, particularly those with atrophic gastritis, long-term use of acid-suppressing medications, or vegetarian/vegan diets, and studies show that deficient individuals often perform worse on cognitive tests than those with adequate status. Clinically, correcting B12 deficiency can lead to measurable improvements in cognition and mood in some patients, which is why B12 levels are routinely checked in the evaluation of cognitive decline and suspected dementia. This medication is commonly used for Stomach Acid.
Jatoi S, Hafeez A, Riaz SU, Ali A, Ghauri MI, Zehra M. Low Vitamin B12 Levels: An Underestimated Cause Of Minimal Cognitive Impairment And Dementia. Cureus. 2020 Feb 13;12(2):e6976. Ueno A, Hamano T, Nagata M, Yamaguchi T, Endo Y, Enomoto S, Kimura H, Ikawa M, Yamamura O, Yamanaka D, Kimura Y, Nakamoto Y, Nishiyama Y. Association of vitamin B12 deficiency in a dementia cohort with hippocampal atrophy on MRI. J Prev Alzheimers Dis. 2025 Sep;12(8):100265. Issac TG, Soundarya S, Christopher R, Chandra SR. Vitamin B12 deficiency: an important reversible co-morbidity in neuropsychiatric manifestations. Indian J Psychol Med. 2015 Jan-Mar;37(1):26-9. Moore E, Mander A, Ames D, Carne R, Sanders K, Watters D. Cognitive impairment and vitamin B12: a review. Int Psychogeriatr. 2012 Apr;24(4):541-56.
Some side effects may be linked to nutrient depletion caused by this medication.
Long-term use of H2 blockers may increase your risk of zinc deficiency. These medications work by reducing stomach acid, which is crucial for absorbing zinc from food. Zinc is an essential mineral that supports a healthy immune system and wound healing. Deficiency can lead to various health problems. A study directly investigated the impact of cimetidine, a common H2 blocker, on zinc absorption. The research found that zinc absorption significantly decreased after cimetidine administration, highlighting the role of stomach acid in this process. Individuals who take H2 blockers for extended periods should consider supplementation with zinc to protect against a deficiency.
Research suggests that long-term use of H2 blockers and antacids might raise the risk of folic acid deficiency. These medications work by reducing stomach acid, which can also play a role in folic acid absorption. Folic acid is crucial for healthy cell growth and development, and a deficiency can lead to various health problems, especially during pregnancy. Some studies show a potential link between H2 blocker/antacid use and lower folic acid levels. Individuals who take H2 blockers or antacids for extended periods should consider supplementation with folic acid to protect against a deficiency.
Research suggests that long-term use of medications that reduce stomach acid, like H2 blockers and PPIs, may be linked to vitamin B12 deficiency. Stomach acid plays a role in releasing vitamin B12 from food, and reduced acid levels caused by these medications could hinder proper B12 absorption. Some studies find an increased risk of B12 deficiency, particularly in older adults or those using these medications for extended periods. Individuals taking H2 blockers or PPIs long-term should consider vitamin B12 supplementation.
Vitamin A plays a vital role in maintaining a healthy gut lining, which is crucial for overall stomach health. This is why some research has explored its potential use alongside other medications for treating ulcers. Research suggests vitamin A supplementation may be effective specifically for treating ulcers alongside H2 blockers.