ANALYSIS ANTIOXIDANT ACTIVITY AND TOTAL FLAVONOID CONTENT COMBINATION OF ETHANOL EXTRACT OF KENCUR RHIZOME (Kaempferiae Galanga L.) AND TAPAK DARA LEAF (Catharanthus Roseus) USING DPPH METHOD: ANTIOXIDANT ACTIVITY. INDONESIAN JOURNAL OF HEALTH SCIENCES RESEARCH AND DEVELOPMENT (IJHSRD), v. 5, n. 2, p. 128–138, 16 Dec.2023.