Putri Deana AA, Minerva P. Formulation and Determination of Tannin and Flavonoid Levels of Anti-Acne Gel Formulation from Red Betel Leaf Extract (Piper crocatum). J. Food Pharm. Sci [Internet]. 2024Apr.30 [cited 2024Jul.18];12(1):61-6. Available from: https://journal.ugm.ac.id/v3/JFPS/article/view/12644