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Wound healing applications GHK-Cu's original research context was wound healing, not cosmetics

Reduced physical discomfort: Some early preclinical research suggests that BPC-157 may have nociceptive (pain relieving) properties

There are, however, randomized, double-blind intervention trials conducted in pregnant women with anemia in Southeast Asia showing that a combination of folic acid, iron, vitamin A, and riboflavin improved hemoglobin levels and decreased anemia prevalence compared to iron-folic acid supplementation alone (23, 24)

M., 2022)
In Arabidopsis, ethylene accumulation due to flooding leads to stabilization of the group VII ETHYLENE RESPONSE FACTORs (ERFVIIs) TFs, through NO depletion, which consequently results in hypoxia acclimation 95,96

Yes, if given subcutaneously for therapeutic purposes, not for routine vaccines
