Sinaga, S. M.; Putra, E. D. L. .; Harfiansyah, M. D. .; Cintya, H. . Application of the Ratio Subtraction Ultraviolet Spectrophotometry Method for Simultaneous Quantification of B1, B2, B3, B6, and B12 Vitamins in Health Supplement Syrups. Trends Sci 2025, 23, 11000.