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76,77,78,79,80,81,82,83 Not all studies reported which form of B12 was used, but all that specified form had used methyl-B12

Common variants of FUT2 are associated with plasma vitamin B12 levels

COVID-19 patients with severe disease exhibit increased monocyte counts with higher frequencies of classical monocytes, lower frequencies of intermediate/non-classical monocytes and elevated plasma levels of C-reactive protein (CRP) and serum TF in comparison to mild disease

Kamachi K , Akiyama H, Zhao R, Zhang L, Gupta SK, Ostermann LB, Otsuki Y, Nagano O, Saya H, Taguchi A, Andreeff M , Ishizawa J

Therapeutic effect of Reduced Glutathione on acute kidney injury in patients with sepsis