Introduction Cysteine, a sulfhydryl-containing proteinogenic amino acid essential for the human body, is employed in a variety of metabolic pathways, such as the regulation of reduced glutathione (GSH), a major endogenous antioxidant molecule and the generation of sulfur-containing biomolecules such as hydrogen sulfide (H 2 S), taurine, coenzyme A and biotin ( Figure 1 ) ( Figure 1 Cysteine metabolism in cancer and tumor microenvironment It is increasingly noted that altered levels of amino acids including cysteine in the tumor microenvironment, by uptake or processing of both intracellular and extracellular regions, have emerged as potential markers of tumor progression
Maintenance ketamine treatment for depression: a systematic review of efficacy, safety, and tolerability
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The active form of glutathione is known as 'reduced glutathione' (GSH), which has been proven to help neutralize free radicals, to offer powerful support for the immune system, and to combat damaging oxidative stress in the body