Sanchia Cleosha Viorina, Septi Handayani, Nisa Kartika Komara, Nawan Nawan, and Ina Arleny. 2026. “Testing the Vitamin B12 Levels in Cassava Tapai”. International Journal of Health Engineering and Technology 4 (5). https://doi.org/10.55227/ijhet.v4i5.503.