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The science tells a different story

Ferritin: A Promising Nanoreactor and Nanocarrier for Bionanotechnology of the Article. ACS Bio Med Chem Au 2(3): 258281

Small 2020 , 16 , e2002343

Are There Any Side Effects of Glutathione Supplements

Figure 1: Chemical structure of Glutathione [source: Accessed: 10 Oct 2012] The presence of the reactive sulphydryl group (originating from the cysteine residue) gives rise to GSHs nucleophilic nature and so it reacts readily with electrophiles which can present high risk of toxicity to the cell by causing oxidative damage such as lipid peroxidation to cell membranes, and interfering with the activity of essential proteins and DNA synthesis

This is why the peptide world is putting it on the radar for antioxidant, anti-inflammatory, and wound healing benefits