While they usually manifest in a specific organ consistently, they can affect other systems
For convenience and needle aversion : Oral GHK-Cu is the easiest option, but understand that systemic benefits will be significantly limited by poor bioavailability
Cationic, amphiphilic peptides that tend to welt reconstitute better in BAC water with 0.9% NaCl: SS-31, MOTS-c, the GH secretagogues (sermorelin, ipamorelin, tesamorelin, CJC-1295), and VIP and kisspeptin-10
If you want to maintain glutathione levels, then it's necessary to protect all the cells in your body
10.1016/j.neuropharm.2019.05.018 56 LauA.VilleneuveN
That said, the compound has not been through full Phase III trials or FDA drug approval