ghk-cu tolerance downregulation desensitization long-term use effectiveness loss The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline Does GHK-Cu Really Work? 40
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Garzon R, Liu S, Fabbri M, Liu Z, Heaphy CE, Callegari E, et al

Do expensive high-concentration products work better than affordable lower-concentration options

Bedekovic V, Mise S, Anic T, et al

J Clin Endocrinol Metab (2009) 94:272934
