Sandhi Nugraheni, Anna Fitriawati, Bagas Ardiyantoro. Optimization And Stability Testing Of Avocado Leaf (*Persea americana*) Extract Soap Formulated With A Combination Of VCO, Palm Oil, And Olive Oil Using The Simplex Lattice Design Method. IJHET [Internet]. 2026 Sep. 10 [cited 2026 Sep. 27];5(3). Available from: https://www.afdifaljournal.com/journal/index.php/ijhet/article/view/1192