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Common reasons include: Pernicious anemia , an autoimmune condition affecting intrinsic factor production Gastrointestinal disorders, such as Crohns disease or celiac disease Prolonged use of certain medications, like proton pump inhibitors Knowing these causes helps spot at-risk people
Interdiscip Toxicol 12(2):4570
60 DuG.SunL.ZhaoR.DuL.SongJ.ZhangL.et al (2016)
2Based on comparison to the national average Annual Percentage Yield (APY) on savings accounts as published in the FDIC National Rates and Rate Caps, accurate as of September 15, 2025
Absorption and Urinary Excretion of Peptides after Collagen Tripeptide Ingestion in Humans
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