Febriani, Yessi, salman salman, Salmah Lubis, and Fara Annisa. “FORMULATION OF RED BETEL LEAF EXTRACT SERUM (Piper Crocatum Ruiz & Pav.) AS ANTIOXIDANT”. Journal of Pharmaceutical And Sciences 5, no. 1 (June 30, 2022): 120-127. Accessed February 7, 2023. https://journal-jps.com/index.php/jps/article/view/107.