n-acetyl glutathione S-Acetyl ULTRA NAC 900mg supports glutathione production NAC | Biotics Research
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However, NAD IV could be more suitable if you seek sustained benefits and a more holistic treatment

Parallel blood aliquots from healthy controls were analyzed using the NADMED assay and two in-house MS methods: LC-MS NADomics 35 and targeted MS-Omics 36
[DOI] [PubMed] [Google Scholar] Cobbett C.S., May M.J., Howden R., Rolls B

a peptide formed by the union of the amino acids: glutamate, cysteine and glycine