Glutathione (Reduced L-Glutathione, GSH) is a naturally occurring tripeptide composed of the amino acids glutamic acid, cysteine, and glycine. It functions as a key intracellular thiol compound and is widely present in biological systems where it participates in redox balance and cellular defense mechanisms.

In research settings, glutathione is frequently utilized to study oxidative stress pathways, cellular detoxification processes, and mechanisms related to redox signaling. Due to its role as an important antioxidant molecule within cells, it is commonly investigated in studies involving cellular protection, metabolic regulation, and overall biochemical homeostasis. Its central role in maintaining intracellular redox equilibrium has made glutathione a widely studied compound in biochemical, metabolic, and dermatological research fields.