Firdaus, Dzikri Anfasa, Fikri Hidayatul Jihad, and Siti Inayah Majreha Mursaha. “Sources of Cysteine-Based Pharmaceutical Drugs and Their Halal Aspects in Product Development”. Halal Studies and Society 1, no. 1 (December 18, 2023): 34–37. Accessed December 25, 2025. https://journal.ipb.ac.id/hass/article/view/52976.