Glutathione and Vitamin C are naturally occurring substances with excellent safety profiles
Use GHK-Cu as directed for your specific product
However, I had seen several great reviews on VITAstir and their products

What's inside Ingredients List Water Skin Conditioning Caprylic/Capric Triglyceride Masking Glycerin Humectant 1,2-Hexanediol Skin Conditioning Alpha-Arbutin Antioxidant Niacinamide 2% Smoothing Cetearyl Alcohol Emollient Cetearyl Olivate Titanium Dioxide Cosmetic Colorant Glutathione Hydrolyzed Collagen Extract Skin Protecting Sorbitan Olivate Emulsifying Ammonium Polyacryloyldimethyl Taurate Emulsion Stabilising Vinyldimethicone Glyceryl Stearate Emollient Polymethylsilsesquioxane Isononyl Isononanoate Emollient T-Butyl Alcohol Perfuming Polyhydroxystearic Acid Emulsifying Aluminum Hydroxide Emollient Ethoxydiglycol Humectant Butyric Acid Masking Glycol Humectant Octyldodecanol Emollient Ethylhexylglycerin Skin Conditioning Asiaticoside Antioxidant Hydrogenated Lecithin Emulsifying Asiatic Acid Skin Conditioning Madecassic Acid Skin Conditioning Glycolipids Skin Conditioning C12-13 Pareth-9 Emulsifying Pueraria Lobata Root Extract Humectant Pinus Palustris Leaf Extract Tonic Ulmus Davidiana Root Extract Skin Conditioning Oenothera Biennis Flower/Leaf/Stem Extract Skin Conditioning Parfum Masking Hexyl Cinnamal Perfuming Linalool Perfuming Limonene Perfuming Water, Caprylic/Capric Triglyceride, Glycerin, 1,2-Hexanediol, Alpha-Arbutin, Niacinamide 2%, Cetearyl Alcohol, Cetearyl Olivate, Titanium Dioxide, Glutathione, Hydrolyzed Collagen Extract, Sorbitan Olivate, Ammonium Polyacryloyldimethyl Taurate, Vinyldimethicone, Glyceryl Stearate, Polymethylsilsesquioxane, Isononyl Isononanoate, T-Butyl Alcohol, Polyhydroxystearic Acid, Aluminum Hydroxide, Ethoxydiglycol, Butyric Acid, Glycol, Octyldodecanol, Ethylhexylglycerin, Asiaticoside, Hydrogenated Lecithin, Asiatic Acid, Madecassic Acid, Glycolipids, C12-13 Pareth-9, Pueraria Lobata Root Extract, Pinus Palustris Leaf Extract, Ulmus Davidiana Root Extract, Oenothera Biennis Flower/Leaf/Stem Extract, Parfum, Hexyl Cinnamal, Linalool, Limonene Key Ingredients Benefits Concerns Ingredients Explained Water

We previously reached out to Dr
Cell Mol Life Sci 57 : 10501093 All-Ericsson C, Girnita L, Seregard S, Bartolazzi A, Jager MJ, Larsson O (2002) Insulin-like growth factor-1 receptor in uveal melanoma: a predictor for metastatic disease and a potential therapeutic target