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GHK-Cu (sister peptide) given by intraperitoneal injection at 0.2/2/20 micrograms/g in mice reduced pulmonary fibrosis via Nrf2/NF-kB/TGF-beta1-Smad2/3 demonstrates systemic-injection dosing of the copper-tripeptide class in animals, relevant to the injectable question but GHK-Cu, lung, mouse

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it has an important role in immune system, cardiovascular, and cognitive function as well

The peptide amplifies your efforts but cannot replace them

These findings establish NNMT inhibition as a viable pharmacological approach to combat sarcopenia and age-related muscle decline