is 4.5 mg ghk cu too much GHK-CU Peptide Dosage Chart: Complete Reference Tables for Every Protocol GHK-Cu is one of the
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doi: 10.1038/s41580-022-00462-1
They are chemically stable together in bacteriostatic water

Genome Medicine

Try to inject in a different spot each time

[3] Bossak-Ahmad, K., Winiewska, M