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Start with a lower concentration (0.51%) if you're new to formulation, then adjust based on skin response

Unlike harsh chemical ingredients that can cause irritation or damage, GHK-Cu is gentle enough for all hair types, including sensitive scalps, and has been proven safe and effective in numerous clinical studies

They do not repair the wiring

The cycling rationale relates to receptor sensitivity research: continuous GHSR stimulation may produce receptor desensitization over extended periods in some research models

The researchers were particularly interested in whether ARA-290 could reduce the reaction of the neurons to capsaicin

Masharani U, Kroon L (2024): Pancreatic Hormones & Antidiabetic Drugs (Chapter 41)