Purwayantie, Sulvi, Dzul Fadly, Sholahuddin, Nur Endah Saputri, and Sri Wijanarti. “Antioxidant Activity From Multiple Extraction Of Kratom Leaf (Mitragyna Speciosa) Without Veins With Sonicator-Type Bath”. Journal of Health and Nutrition Research 1, no. 3 (November 30, 2022): 178–184. Accessed March 10, 2025. https://journalmpci.com/index.php/jhnr/article/view/82.