Question: what is the difference between l-glutathione and glutathione?
Answer: Glutathione is a tripeptide—i.e., a tiny protein—composed of three amino acids: cysteine, glycine, and glutamic acid (or glutamate). ... There are two different forms of glutathione: reduced glutathione (GSH, or L-glutathione), which is the active form, and oxidized glutathione (GSSG), the inactive state.