Aspadiah, V., Akib, N.I., Indalifiany, A., Muliadi, R. and Layuk, R.R. 2025. Optimization of Tween 80 and Span 80 Combination in the Formulation of Niacinamide-Containing Body Lotion. Journal of Pharmaceutical and Natural Resources. 1, 1 (Jun. 2025), 1–7. DOI:https://doi.org/10.23960/jpnar.v1i1.pp1-7.