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Importantly, all ASVs within six of the genera mapped to identical species when analyzed by both methods

It can also be depleted by chronic stress, alcohol, smoking, digestive issues, cardiovascular disease, illness, and aging because stomach acid production decreases with age, reducing B12 absorption significantly

The multi-faceted basis of vitamin B12 (cobalamin) neurotrophism in adult central nervous system: lessons learned from its deficiency

The safest response is to raise it with your GP or haematologist, who can look at your schedule, your dose and your original results together

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[DOI] [PubMed] [Google Scholar] 121.Kendall DM, Riddle MC, Rosenstock J, et al