Glutathione (GSH) is a critical intracellular antioxidant and thiol that plays a vital role in maintaining cellular redox balance and detoxifying electrophilic compounds. It is synthesized from amino acids and acts as a cofactor for enzymes like glutathione S-transferases (GSTs) and glutathione peroxidases (GPx). GSH is involved in various cellular processes, including the glyoxalase system, ribonucleotide reduction, and regulation of protein and gene expression. Imbalances in GSH levels are associated with numerous diseases, including cancer, neurodegenerative disorders, cystic fibrosis (CF), HIV, and aging. GSH metabolism is regulated by enzymes such as γ-glutamylcysteine synthetase (γ-GCS), which is influenced by genetic polymorphisms that affect disease susceptibility and progression. GSH also plays a role in immune responses, with GSH levels influencing Th1/Th2 balance and disease outcomes in HIV. GSH homeostasis is crucial for protecting cells from oxidative stress, and its depletion can lead to increased ROS production and cellular damage. GSTs, a family of Phase II detoxification enzymes, are also involved in redox regulation and have been linked to drug resistance and disease progression. Polymorphisms in GSTs, such as GSTM1 and GSTT1, are associated with increased cancer risk. GSH and GSTs are also involved in cellular signaling pathways, including those related to apoptosis and proliferation. Alterations in GSH:GSSG ratios can affect signaling pathways and contribute to disease. GSH deficiency has been linked to increased oxidative stress and disease progression in conditions such as Parkinson's disease and HIV. Maintaining GSH levels through dietary supplementation or therapeutic interventions may offer potential benefits in these diseases. Overall, GSH plays a central role in cellular redox balance and is essential for preventing oxidative damage and maintaining health.Glutathione (GSH) is a critical intracellular antioxidant and thiol that plays a vital role in maintaining cellular redox balance and detoxifying electrophilic compounds. It is synthesized from amino acids and acts as a cofactor for enzymes like glutathione S-transferases (GSTs) and glutathione peroxidases (GPx). GSH is involved in various cellular processes, including the glyoxalase system, ribonucleotide reduction, and regulation of protein and gene expression. Imbalances in GSH levels are associated with numerous diseases, including cancer, neurodegenerative disorders, cystic fibrosis (CF), HIV, and aging. GSH metabolism is regulated by enzymes such as γ-glutamylcysteine synthetase (γ-GCS), which is influenced by genetic polymorphisms that affect disease susceptibility and progression. GSH also plays a role in immune responses, with GSH levels influencing Th1/Th2 balance and disease outcomes in HIV. GSH homeostasis is crucial for protecting cells from oxidative stress, and its depletion can lead to increased ROS production and cellular damage. GSTs, a family of Phase II detoxification enzymes, are also involved in redox regulation and have been linked to drug resistance and disease progression. Polymorphisms in GSTs, such as GSTM1 and GSTT1, are associated with increased cancer risk. GSH and GSTs are also involved in cellular signaling pathways, including those related to apoptosis and proliferation. Alterations in GSH:GSSG ratios can affect signaling pathways and contribute to disease. GSH deficiency has been linked to increased oxidative stress and disease progression in conditions such as Parkinson's disease and HIV. Maintaining GSH levels through dietary supplementation or therapeutic interventions may offer potential benefits in these diseases. Overall, GSH plays a central role in cellular redox balance and is essential for preventing oxidative damage and maintaining health.