A review of GHK-Cu s wound healing and skin regeneration research by Pickart and Margolina (2018), highlighted the importance of sustained application for achieving the full range of GHK-Cu s documented biological effects
Each drop provides a refreshing coolness, and immediately after use, the skin looks rested, as if filled from within
A clinical study found that taking liposomal glutathione raised glutathione levels in the blood by up to 40% within two weeks, and contributed to improvements in immune function and measurable drops in oxidative stress

The Ordinary Multi-Peptide + Copper Peptides 1% Serum Best budget pick Photo by Innerbody Research Pros Contains GHK-Cu and four branded peptide ingredients Hyaluronic acid can support skin hydration and health Free of alcohol, oil, silicone, and gluten Cruelty-free and vegan Can be found online or in brick-and-mortar stores More affordable than many other copper peptide serums Free shipping on orders over $25 Products can be returned up to a year after purchase Subscribe to save 10% Cons Clinical testing is claimed, but no results or evidence available Product pH may not be acidic enough (6.0-7.0) for ideal skin health Has a distinct metallic smell that can linger for hours after use Some customers complain of a burning sensation or acne Website checkout can be finicky The Ordinary is one of the most well-known cosmetic manufacturers in the world today, beating legacy brands like Dove and Neutrogena by a long shot in search volume.28 The company focuses on selling sustainable self-care products skin care, body care, and hair care at affordable prices

It seems to be well tolerated, but there is not enough research to know what side effects it may cause
The WGCNA approach, applied to this set of microarray data, clusters co-regulated genes based on their co-expression pattern and organizes them into modules. An eigengene score is thereafter applied to each module derived from the z-scored log 2-fold change values of the genes consisting the module (module membership)