Some hints from those studies are promising, which is why influencers and scientists got excited about BPC-157
Arch Biochem Biophys 237:408414 Cadenas E, Boveris A, Ragan CI, Stoppani AO (1977) Production of superoxide radicals and hydrogen peroxide by NADH-ubiquinone reductase and ubiquinol-cytochrome c reductase from beef-heart mitochondria
Sources: Journal of Nutrition
Volkova A, Shadrina M, Kolomin T, et al (2016) Selank administration affects the expression of some genes involved in GABAergic neurotransmission
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Sermorelin, ipamorelin, or CJC-1295 (often used together) stimulate your body's natural GH production