acidified nitrite glutathione The Key Enzymes of Carbon Metabolism and the Antioxidant System Protect Yarrowia lipolytica Yeast Against pH-Induced Stress It is involved in various biochemical processes Glutathione - Wikipedia
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Something could have gone wrong with the test itself , though the lab usually detects it if all their tests get unusual results

Azelia I-Glo Glutathione Vitamin C Complex Food Supplement Tablet is a powerful daily antioxidant formula designed to support skin brightening, even tone, and overall wellness

Buckway CK, Guevara-Aguirre J, Pratt KL, Burren CP, Rosenfeld RG

Henderson MJ, Larsson A, Carlsson B, Dear PR

[DOI] [PMC free article] [PubMed] [Google Scholar] Pedersen A