<![CDATA[The demand for organic cosmetics, including lip balms, is increasing. While soybean oil and carnauba wax are known for their beneficial properties in cosmetics, their specific combination in a lip balm formulation has not been previously explored. This study aimed to determine the optimal lip balm formulation from a combination of soybean oil and carnauba wax and to analyze the effect of varying formulations on the product's physicochemical characteristics. The lip balms were prepared using a melt-and-mix method. Physicochemical properties (pH, melting point, adhesion time, loss on drying and greasiness) were evaluated according to the Indonesian National Standard (SNI) 16-4399-1996. A Non-Factorial Completely Randomized Design (CRD) was employed, and the data were analyzed using ANOVA followed by Duncan’s Multiple Range Test (DMRT). Results indicated that the formulation significantly affected (p<0.05) the melting point, adhesion time, greasiness and loss on drying but did not significantly affect the pH. Formulation 5 (F5) was selected as the optimal formulation, exhibiting the following characteristics: a pH of 6.206, a melting point of 66.00 °C, an adhesion time of 9.00 seconds, loss on drying (LoD) 0.043% and greasiness 8.20 cm. Furthermore, hedonic testing revealed that F5 was the formulation most preferred by panelists. In conclusion, the combination of soybean oil and carnauba wax can yield a natural lip balm with desirable properties and high consumer acceptability, with F5 identified as the optimal formulation in this research.]]>
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