2019 [cited 2021 Sep 4];9
Together the two represent distinct but converging mechanisms studied in metabolic research
However, certain circumstances may warrant testing including pre-existing liver or kidney conditions where monitoring organ function during therapy provides appropriate oversight, specific health concerns that might benefit from objective biomarker assessment, desire to objectively measure oxidative stress markers or glutathione status before and during therapy, and medical conditions requiring monitoring for safety reasons
ACS Appl Mater Interfaces 8:1624813256 Waseem A, Yaqoob M, Nab A (2008) Flow-injection determination of cysteine in pharmaceuticals based on luminol-persulphate chemiluminescence detection
For a plain explanation of why supplement style products are held to a different standard than approved drugs, see the United States Food and Drug Administration consumer guidance on dietary supplements, which explains why supplement style products are not tested for effectiveness before they are allowed to reach the market