ghk cu copper tripeptide hair growth evidence Loss Study (2021) — Research Summary ghk-cu peptide hair growth evidence
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Patients unconsciously breathe shallowly to avoid discomfort, which can trigger tension in the serratus anterior, thoracic spine muscles, and diaphragm

This mechanism is also the source of cancer-related concerns (more below)
At one point, even putting on a shirt was a painful challenge

Avoid layering GHK-Cu with strong actives like retinoids or AHAs in the same routine to reduce the risk of irritation
