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If you suspect a deficiency, a blood panel is the appropriate diagnostic step

Yin J, Li Y, Tian Y, Zhou F, Ma J, Xia S, et al

Moreover, glutamine metabolism provides nitrogen for nucleotides nitrogenous base and amino acid synthesis and participates in glutathione and NADPH production, which is relevant for maintaining redox balance 1
Brimley SC, Yafi FA, Greenberg J, Hellstrom WJG, Tue Nguyen HM, Hatzichristodoulou G
