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For anyone wondering, Glutathione is a powerful antioxidant known for its skin-brightening properties, helping to reduce the appearance of dark spots and hyperpigmentation
Colour is the most immediately useful signal: copper(II) peptide complexes are blue to violet, and the intensity and hue relate to the coordination environment, so a marked change in colour genuinely indicates that something about the complex has altered
Starting with lower doses, keeping detailed notes on effects, and being prepared to discontinue if unexpected responses occur represents a prudent approach
doi: 10.1016/s0167-7799(00)01433-5, 75
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