ghk-cu tolerance desensitization long-term effectiveness Copper Peptide Regeneration Review (2018) — Research Summary GHK-CU Making Skin Worse: Complete
Description
Sikiric et al

Most data are extrapolated from NNMT biology and animal work
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Vegans, vegetarians, older adults, people with digestive problems, and those on certain long-term medications
This creates a dual mechanism of action
