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Active ingredients are delivered through the skin into the bloodstream rather than being broken down through digestion, helping reduce nutrient loss and wasted ingredients

Glutathione, a tripeptide, contains a normal peptide bond (between cysteine and glycine) and an isopeptide bond (between glutamate and cysteine)

The author acknowledges the use of free ChatGPT for language polishing and grammar refinement of the manuscript

Where GHK-Cu uses glycine as its first amino acid, AHK-Cu uses alanine

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Advances in molecular biology continue to provide researchers with new opportunities to investigate naturally occurring peptides at greater depth