Valencia, Regina, Elsa Trinovita, Herlina Eka Shinta, Angeline Novia Toemon, & Ysrafil Ysrafil.
" Evaluation of the combination patch of betel leaf extract (Piper sp.) - ultrasonic assisted extraction as a transdermal delivery system on fibroblast cell formation and collagen density." <em>JURNAL ILMU KEFARMASIAN INDONESIA</em> [Online], 23.1 (2025): 199-210. Web. 19 Sep. 2025