Because glutathione is quickly broken down by digestive enzymes, oral supplements of glutathione are poorly absorbed
However, inform your healthcare provider about any peptide use, especially if you're on medications affecting copper metabolism or have copper-related conditions
This distinction matters
These ranges are research planning, not personal dosing recommendations, and no published human Phase 2 or Phase 3 dose-finding trial exists
Although short-term use of unapproved peptides appears to be mostly safe, the larger concern lies with downstream side effects that we just dont know about, says Cushman
Pickart stated that GHK-Cu has a favorable safety profile, highlighting that there is no indication that it causes side effects in test subjects [2]: The molecule is very safe and no issues have ever arisen during its use as a skin cosmetic or in human wound healing studies. In a 2018 review based on new genetic data, he reiterated that all biological actions associated with GHK appear to be health positive. He pointed to over four decades of GHK research encompassing cell, tissue, and animal studies, also noting the peptides inclusion in commercial anti-aging and cosmetic products such as creams, liposomes, and dermal patches [1]
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