Unlike other antioxidants that you must get primarily from your diet, your body builds its own supply of glutathione, primarily in the liver
Membrane lipids: where they are and how they behave
However, human safety data remains limited to anecdotal reports and Phase I/II trial abstracts that never reached full peer-reviewed publication
Development 133, 865875
Toxicol Pathol 32:4149 Tanjasiri P, Kozbur X, Florsheim WH (1976) Somatostatin in the physiologic feedback control of thyrotropin secretion
At optimal concentrations, GHK-Cu increases mRNA production for collagen types I and III, elastin, proteoglycans, and glycosaminoglycans, while laboratory studies show that topical application for 12 weeks improves collagen production in 70% of subjects compared to 50% with vitamin C and 40% with retinoic acid