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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

Liang Z, Chen T, Yang F, Li S, Zhang S, Guo H (2022) Toxicity of chronic waterborne zinc exposure in the hepatopancreas of white shrimp Litopenaeus vannamei

Evidence of Drug-Nutrient Interactions with Chronic Use of Commonly Prescribed Medications: An Update

[DOI] [PubMed] [Google Scholar] 73.Wu Y., Siadaty M

"Since finding out [my vitamin B12] is low, I started eating more meat, and at least one serving of red meat a day