|Graphic from the inimitable benbest.com. GSH is glutathione.|
Also note the importance of amino acids like cysteine, glycine, and serine: Cysteine and glycine are converted to glutathione (an important water-soluble antioxidant) with the addition of selenium. Pea protein and collagen are good sources of glycine, but neither contains much cysteine. Serine can reduce homocysteine levels, and pea protein is also a good source.