Rosemary oil is an essential oil extracted from the leaves of the rosemary plant, also known as Rosmarinus officinalis. It has a fresh, woody, and slightly camphor-like aroma. It is known for its energizing, stimulating and refreshing properties and has been traditionally used to help with fatigue, mental clarity, and concentration. Rosemary oil is also believed to have antimicrobial properties, which may make it useful for treating certain skin conditions and also it is used in aromatherapy to help with respiratory issues such as colds, coughs and sinusitis. It is also used as a flavor enhancer in food and beverages. It is considered safe for most people when used topically in small amounts, but it's always best to do a patch test before using it and to consult with a healthcare professional before using it internally, as large doses can cause skin irritation, and other adverse effects.