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GHK is a tripeptide glycyl-L-histidyl-L-lysine isolated from human plasma in 1973 by Loren Pickart and Malcolm Thaler, who were investigating why serum from younger donors supported cultured liver cells better than serum from older donors

Stop taking multivitamins such as vitamin C or herbal supplements

Injection-site reactions and fatigue Injectable medicines can cause redness, itching, tenderness, bruising, or swelling where the injection is given

Iwasaki, K., Ogawa, Y., Shibata, S

Gradual Introduction: Start with lower concentrations (e.g., 0.05% to 1%) and less frequent application (e.g., every other day) to allow the skin to acclimate, especially for sensitive skin types