ghk-cu long-term use effectiveness tolerance A Dermatologist's Take on the Copper Peptide (GHK-Cu) Trend If You Stop GHK-Cu What
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Leah K.Verified PurchaseMar 15, 2026 Five weeks in and friends have asked what I am doing differently

A brand-new 2024 pilot gave two healthy adults up to 20 mg intravenously for two days zero side effects, normal blood tests, heart, liver, kidney, and thyroid markers all fine

The short answer: there is promising but limited evidence
