Extended activity: Reduced binding-protein affinity gives a longer half-life than native IGF-1, the analogs defining feature [2]
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Khavinson VK, Bondarev IE, Butyugov AA
4,5,6,7 The important part of NAD+ is that its a long game
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In the only head-to-head comparison (Abdulghani 1998), copper peptide produced a higher procollagen response rate (70% vs 40%) over one month, but retinol studies over longer periods show substantial collagen increases too