Namira Fitriyani and Wisik Adelina 2022. NANO SPRAY ANTI ACNE: NANOTECHNOLOGY-BASED SERUM SPRAY INNOVATION FROM BETEL LEAF EXTRACT IN OVERCOMING PROPIONIBACTERIUM ACNES BACTERIA CAUSES BY ACNE PROBLEMS. Khazanah: Jurnal Mahasiswa. 13, 4 (May 2022). DOI:https://doi.org/10.20885/khazanah.vol13.iss4.art22.