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Estradiol E2 C18H24O2 272.4 Progesterone P4 C21H30O2 314.5 Hydrocortisone HC C21H30O5 362.5 KPV KPV Chemistry pending GHK-Cu GHK-Cu Chemistry pending Argireline ARGI C35H62N14O11S 887.0 Matrixyl MATRX C39H75N7O10 802.1 SNAP-8 SNAP-8 C41H70N16O16S 1075.2 Melanostatine MELST C61H87N15O9S 1206.5