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How do we control our state so we show up the way we want to
It is truncated analogue of growth hormone releasing hormone (GHRH), which was developed in 1980s from original GRF 1-29, but with purposefully prolonged half-life to ensure better therapeutical use
GHK occurs naturally in human plasma at concentrations that decline with age (published studies report ~200 ng/mL in adults around age 20, dropping to ~80 ng/mL by age 60), which has driven sustained research interest in the GHK-Cu peptide as a model compound for age-related cellular biology
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