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Waste cooking oil (WCO) is a significant waste stream globally, generated by households, restaurants, food processing industries, and other sources. Improper disposal of WCO poses environmental challenges worldwide, including sewer blockages, water and soil pollution, and habitat destruction. These impacts can harm ecosystems, wildlife, and human health. Hence, the WCO can be one of the alternatives that can be used in soap production in a process called saponification. Using coconut husk as an absorbent to purify WCO for soap production as a natural absorbent that aligns with the principles of sustainability and waste reduction. This research focuses on the effectiveness of coconut husk as an adsorbent for purifying WCO, followed by the utilization of the purified oil to produce liquid soap. The study also includes an analysis of the soap’s quality through various analysis. The result shows value of Free fatty Acid (FFA) content in WCO decreased from 0.282% before purification to 0.216% after purification. Lower FFA levels mean better soap quality because high FFA can lead to issues like bad smell, impurities, less lather, and diminished stability. So, reducing value of FFA through purification improves the soap’s quality, making it more effective and long-lasting. This research also compared a soap to ZIP Concentrated Cream Cleanser across various parameters including saponification value, moisture content, pH and foamability test. The results showed that both products exhibited differences in saponification value. Overall, saponification analysis plays a crucial role in soap production by guiding formulation and ensuring quality. Overall, utilizing coconut husk as an adsorbent to purify WCO for soap production offers environmental benefits and enhances sustainability. This project utilizes natural, renewable materials and contributes to the circular economy by repurposing a byproduct into a useful commodity.