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GHK-Cu (glycyl-L-histidyl-L-lysine complexed with copper(II)) is an endogenous human tripeptide of the sequence Gly-His-Lys that chelates Cu2+
Many people are interested in glutathione for its skin whitening effects
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Gene Activation: MC1R activation initiates a signaling cascade (cAMP production $\rightarrow$ MITF expression) that induces the enzymes (tyrosinase) necessary for eumelanin production
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