Yes, GHK-Cu Cream is generally safe for all skin types
A contributing factor to the complexity of in vivo administration of opioid drugs is the number of clinically important differences among opioids, including differences in pharmacokinetics, potency, and efficacy
Copper and zinc compete for absorption, so increasing copper exposure through GHK-Cu warrants attention to zinc status
IV glutathione can be great for addressing more acute conditions or deficiencies, but boosting intracellular glutathione levels in the long term is best addressed with lifestyle changes and a daily glutathione supplement
10.1016/j.ejphar.2025.177430 94 SongD.GuiF.LiG.ZhuangS.SunJ.TanX.et al (2025)
While we dont have clear evidence here, it varies from person to person