Antioxidan Activity from Methanol Extract of Kratom Leaves (Mitragyna speciosa) Maseration Result Using The DPPH Method: Aktivitas Antioksidan Ekstrak Metanol Daun Kratom (Mitragyna speciosa) Hasil Maserasi Menggunakan Metode DPPH. Pharmasci [Internet]. 2023 Jul. 23 [cited 2026 Apr. 2];8(2):137-42. Available from: https://ejournal.akfarsurabaya.ac.id/index.php/jps/article/view/357