Sinaga, Siti Morin, Effendy De Lux Putra, M. Deddy Harfiansyah, and Henni Cintya. 2025. “Application of the Ratio Subtraction Ultraviolet Spectrophotometry Method for Simultaneous Quantification of B1, B2, B3, B6, and B12 Vitamins in Health Supplement Syrups”. Trends in Sciences 23 (1). Nakhon Si Thammarat, Thailand:11000. https://doi.org/10.48048/tis.2025.11000.