This collection opens with a review of the plant sources, extraction methods, physicochemical characterization and commercial applications of edible and non-edible vegetable oils. The authors describe the extraction of essential oil through ultrasound to increase the productivity of favourable essential oils. The operation of ultrasound-assisted extraction along is also described. In one study, the antimicrobial activity of the essential oil derived from Campomanesia aurea O. Berg leaves is evaluated, and its antibiotic modulating potential is assessed. In a subsequent study, the authors investigate the chemical composition of compounds from E. intermedium leaf essential oil, in addition to its modulatory and antibacterial action. Additionally, the biological aspects attributed to the medicinal benefits of sandalwood oil and alpha-santalol are presented along with relevant clinical evidence.