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Some people have more subcutaneous tissue than others

Start with a 0.5% concentration and increase as tolerated

GHK-Cu (glycyl-L-histidyl-L-lysine copper complex) is a naturally occurring copper peptide found in human plasma, saliva, and urine

However, for long-term storage (several months to years), it is preferable to store peptides in a freezer at -80C (-112F)

Injectable protocols require reconstitution calculator, sterile technique, and proper storage, which represents a higher compliance burden

J Clin Endocrinol Metab 96:2097 Hirschberg R, Ding H, Wanner C (1995) Effects of insulin-like growth factor I on phosphate transport in cultured proximal tubule cells