Putri Deana, A. A. and Minerva, P. (2024) “Formulation and Determination of Tannin and Flavonoid Levels of Anti-Acne Gel Formulation from Red Betel Leaf Extract (Piper crocatum)”, Journal of Food and Pharmaceutical Sciences, 12(1), pp. 61-66. doi: 10.22146/jfps.12644.