The injectable forms of GHK-Cu sold online are classified as unapproved drugs and "research chemicals." They have not been evaluated for safety or efficacy by the FDA, making it illegal for companies to market them for human consumption or medical treatment
(PubMed) Disclaimer The Linus Pauling Institute's Micronutrient Information Center provides scientific information on the health aspects of dietary factors and supplements, food, and beverages for the general public
If you want a deeper look at why delivery matters so much, start with our All About Liposomes guide
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Another form of glutathione that has gained attention is liposomal glutathione