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Serum vitamin B-12 levels of 200 pg/ml or below would confirm a deficiency, however measuring homocysteine and methylmalonic acid can also offer insight into vitamin B-12 activity. In a recent study, some older adults showed signs of cognitive and neurological issues despite B12 levels that were technically within the normal range but on the lower end

Sarcoma 2020 , 8713165 (2020)

albicans in both in vitro and in vivo studies (McCarthy et al., 1985) while human cells were not affected

Deficiency can impair muscular endurance, strength output, and recovery between training sessions

doi: 10.1074/jbc.REV119.008351 109 EdgertonDSKraftGSmithMFarmerBWilliamsPECoateKCet al