Matondang FH, Lubis MS, Yuniarti R, Rani Z. Formulation of used tea bags nano powder facial mask and antibacterial activity against Propionibacterium acnes and Staphylococcus epidermidis. JPS [Internet]. 2025 Jan. 3 [cited 2025 Feb. 22];8(1):1-21. Available from: https://journal-jps.com/new/index.php/jps/article/view/685