<p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; text-align: justify; text-indent: -.1pt; line-height: normal;"><span style="font-size: 11.0pt; font-family: 'Calibri','sans-serif'; mso-fareast-font-family: Calibri;" lang="IN">Problems on facial skin that often occur are caused by free radicals. Free radicals can cause cell damage in the form of premature aging which is characterized by a lack of elasticity in the skin, black spots appear, skin looks duller and there is pigmentation. Free radicals can be counteracted by giving antioxidants. Antioxidants are molecular compounds that can release electrons and neutralize free radicals in order to prevent cell damage. One of the natural ingredients that can be used to treat premature aging is olive oil. Olive oil is believed to help maintain skin moisture and elasticity as well as expedite the skin regeneration process, so that the skin is not easily dry and wrinkled. The aim of the research was to determine the results of the physical properties test of olive oil and niacinamide facial wash preparations and to determine the right and optimum formula for the surfactant combination of sodium lauryl sulfate (SLS) and cocamidopropyl betaine. The type of research used is laboratory experimental with the Simplex Lattice Design (SLD) method. According to the results of the physical properties of the 8 formulas, the facial wash preparations met the physical properties tests such as organoleptic, homogeneity, pH, foam stability, spreadability and viscosity which met the requirements according to SNI. Olive oil and niacinamide facial wash preparations have an optimum formula at a concentration of 0.75% SLS and 0.25% cocamidopropyl betaine.</span></p><em><span style="font-size: 11.0pt; line-height: 115%; font-family: 'Calibri','sans-serif'; mso-fareast-font-family: Calibri; position: relative; top: .5pt; mso-text-raise: -.5pt; mso-ansi-language: IN; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;" lang="IN">Facial Washes; olive oil; Niacinamide</span></em>