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Extracellular Matrix (ECM) and Fibroblast Signaling Models GHK-Cu has been studied in fibroblast and skin cell systems to evaluate the regulation of ECM components such as collagen, elastin, proteoglycans, and glycosaminoglycans

Who is at higher risk / contraindications Sourced where possible

Another study showed that testicular CAT and GSH remained unchanged while a significant increase in SOD was noted 33

however, I read from a breastfeeding group that it's best to avoid whitening soap, lotion, and especially supplements while lactating

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This synthetic peptide falls under Category 2 of bulk substances in compounding