Aspadiah, V.; Akib, N. I.; Indalifiany, A.; Muliadi, R.; Layuk, R. R. Optimization of Tween 80 and Span 80 Combination in the Formulation of Niacinamide-Containing Body Lotion. J. Pharm. Nat. Resour. 2025, 1, 1-7.