No, glutathione is not an amino acid, but a so-called tripeptide: a small chain of three amino acids that together form a stable molecule.

Reduced glutathione, abbreviated as GSH, is the active form of glutathione as used in supplements. This form is the most researched and applied.

Glutathione is not an essential nutrient like vitamins or minerals that must be obtained through food, but it can be added to daily intake through supplements.

Yes, glutathione naturally occurs in small amounts in certain foods such as vegetables, fruit, and meat, but the amounts vary greatly.

GSH is the reduced, stable form of glutathione. There are also forms such as S-acetyl-glutathione or liposomal variants, each with their own composition.