Nowadays, it is synthesized
Unlike superoxide and hydroxyl radical, which have very short half-lives, hydrogen peroxide has a longer half-life and functions as a signaling molecule
The peptide triggers gene expression changes in over 4,000 genes that persist beyond the moment of injection (Pickart & Margolina, 2018)
Whether fragments retain any activity is unknown
Plant Cell 22: 12161231 Matern S, Peskan-Berghoefer T, Gromes R, Kiesel RV, Rausch T (2015) Imposed glutathione-mediated redox switch modulates the tobacco wound-induced protein kinase and salicylic acid-induced protein kinase activation state and impacts on defence against Pseudomonas syringae
Glutone 1000 is an effervescent L-Glutathione tablet with 600 mg Setria Glutathione, 400 mg NAC, Vitamin C & Selenium