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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

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Niacinamide strengthens the skin barrier, reduces redness, and calms inflammation that can interfere with the repair process

GHK-Cu (Copper Peptides) Available as either a topical cream or an injectable, GHK-Cu is a powerful skin-rejuvenating peptide known for its ability to tighten and firm loose skin, improve elasticity and density, and reduce the appearance of fine lines and wrinkles