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Cancer 1873, 188314

The results timeline follows a predictable pattern

A 2016 study published in Nature Scientific Reports showed that GHK-Cu had no cytotoxicity to human keratinocytes at concentrations up to 5,800 micromolar over 72 hours and did not induce inflammatory biomarkers

Glutathione in defense and signaling: lessons from a small thiol Ann NY Acad Sci

It is FDA-approved, albeit for treatment of a very specific and rare mitochondrial disease (Barth Syndrome)

Standardized extracts and preparations subjected to quality control provide more reliable pharmacological effects in comparison to raw or non-standardized herbal products