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Unfortunately, some patients have difficulty absorbing an adequate amount of vitamin 12 because they do not produce enough stomach acid due to a condition called autoimmune atrophic gastritis which can cause a deficiency of vitamin B12

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The benefits can vary from person to person, but many individuals report increased energy, improved mood, enhanced focus, and a general sense of vitality

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"Systematic review and pragmatic clinical approach to oral and nasal vitamin B12 (cobalamin) treatment in patients with vitamin B12 deficiency related to gastrointestinal disorders"