Rosemary essential oil is derived from the leaves of the rosemary plant (Rosmarinus officinalis) through a process of steam distillation. Rosemary is a fragrant herb that is commonly used in cooking, but its essential oil also has various potential health and wellness benefits. It’s important to note that while many people find rosemary essential oil beneficial, individual reactions may vary, and it’s always a good idea to consult with a healthcare professional before using essential oils for therapeutic purposes.