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In a split-face randomized study (N=67) evaluating a 1% GHK-Cu serum over 12 weeks, 12% of participants reported transient erythema in the first two weeks, resolving spontaneously without discontinuation (Leyden et al., 2018, see related wound-healing data at NCBI)
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its increasingly understood to stem from shared neurobiological foundations
Document daily dose and injection site to maintain consistency
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