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References Maar K, Hetenyi R, Maar S, Faskerti G, Hanna D, Lippai B, Takatsy A, Bock-Marquette I

Similar results were obtained by Fraczek in 80 Polish athletes, where 2.5% of subjects did not achieve the level of Estimated Average Requirement, whereas the excessive intake of cobalamin was observed in 96.5% [38]

A full blood count and serum B12 measurement are straightforward investigations that can help differentiate causes

However, if you can absorb B12 through the stomach, adenosyl B12 tablets can be a great option
