Can You Use GHK-Cu Every Day?

The 2010 study applied a copper-tripeptide preparation to excised human skin in laboratory diffusion cells and followed copper penetration and retention over 48 hours. It compared experimental skin layers, not different daily routines in living people. [1]

Its analytical method measured elemental copper. It did not determine that every measured copper atom remained attached to GHK, and the amount retained in the tissue was not a clinical measure of benefit or tolerability. [1]

A 2015 review summarizes cosmetic studies of GHK-Cu preparations. A regimen used to test one preparation does not, by itself, establish the best frequency for all GHK-Cu creams. Establishing an optimal schedule would require an actual comparison of schedules for the relevant formulation and outcome. [2]

The review’s authors list Skin Biology’s Research & Development Department as their affiliation, a relevant commercial skincare connection; they also declare no conflict of interests regarding publication. Their review should not be treated as an independently conducted trial of daily-use guidance. [2]

Do not infer a daily schedule from the word “peptide,” a penetration finding, or another product’s study protocol. Ask your provider to clarify the directions for your actual cream and how any other products fit into the plan; this is individualized guidance, not a frequency established by the studies above.