ghk-cu injection risks Copper, Collagen, and Controversy: Inside the Buzz How Long Does GHK-Cu Last?

10.1158/0008-5472.Can-20-0233 114 ZengS.HuangW.ZhengX.LiyanC.ZhangZ.WangJ.et al (2021)

The effect is localized first and then systemic so although the absorption is much less, its quite effective for the problem being addressed

Injections are administered with clinical oversight and individualized dosing

You follow the steps carefully, and a bruise still shows up

This is not a failure of the medication

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