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