This module introduces learners to the sustainable conversion of used cooking oil (UCO) into non-edible value-added products. Students will first explore the characteristics and chemical behavior of used cooking oil, including the changes that occur during repeated heating and the environmental issues caused by improper disposal. Building on this understanding, learners will then be guided through two practical applications: the production of soap using the cold-process saponification method, and the production of scented candles using UCO as a base material. Each section is designed to provide foundational theory, essential calculations, identification of materials, and hands-on procedures. By the end of this module, students will gain both conceptual understanding and practical skills related to waste valorization and simple product formulation.