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doi.org/10.1038/newbio243085a0 Sikiri, P., et al

Vitamin D injections allow for more efficient absorption of calcium, which helps keeps bones healthy

Importantly, FOXO4-DRI showed no significant toxicity towards normal TM3 Leydig cells, demonstrating its selective action against senescent cells

Reference: Sikiric P, Seiwerth S, Grabarevic Z, et al

However, it's important to note that despite its prospects as an injectable treatment, GHK-Cu's systemic effects are only supported by animal and in vitro studies

Following subcutaneous injection, the peptide enters systemic circulation with bioavailability of 14-19% in rats, while intramuscular administration achieves 45-51% bioavailability in beagle dogs, indicating both route-dependent and species-dependent absorption characteristics