Rosemary oil is extracted from the plant Rosmarinus officinalis. Rosemary oil has therapeutic properties that have been used since ancient times, especially culinary and medical uses among ancient Greeks and Romans. Rosemary oil has a good odor and antimicrobial effects that are used to treat infections and allow the meat to last longer when cooked with rosemary leaves. The oil is extracted from the leaves through steam distillation. Steam distillation is a process that uses hot water to extract essential oils from plants. There are a variety of methods used to extract essential oils, depending on the source of the raw material and its quality.