Onion peel contains flavonoid and phenolic compounds that have potential as antioxidants; however, they have limitations in stability and bioavailability. Onion peel extract has a dark red color and a characteristic onion peel odor, with moisture content, water-soluble extractive content, ethanol-soluble extractive content, and total ash content of 7.33% ± 0.577; 35.33% ± 2.01; 80.8% ± 2.49;…