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Low B12 may indicate a more severe condition, however, its unlikely that it would be the first, or only symptom, Franklyn says

Certain health conditions that affect the gut, like Crohns or celiac disease, can also make absorption a major challenge

[DOI] [PMC free article] [PubMed] [Google Scholar] 190.Reichenbach A., Bringmann A

However, potency does decline gradually over time

This comparison examines the published literature on each compound to help researchers understand their respective properties and potential research applications
