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Animal Model Evidence The systemic evidence base is entirely preclinical: Pulmonary fibrosis (mouse model): Intraperitoneal GHK-Cu at 0.2-20 micrograms/g/day protected against bleomycin-induced lung fibrosis by inhibiting TGF-beta1/Smad signaling and reducing oxidative stress (PMID 31809714)

However, the study grouped dosages of under 50 mg together, making it hard to determine the risk of low dosages of iron, such as those in many multivitamins

The technique is straightforward and becomes routine after a few days of practice

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