Lemon balm oil is an essential oil extracted from the leaves of the Melissa officinalis plant, also known as lemon balm. It is a colorless to pale yellow liquid with a fresh, lemony and slightly herbaceous aroma. It is commonly used in traditional medicine as a natural remedy for anxiety, stress, and insomnia. It is also used in perfumery as a top note to add a fresh and lemony aroma to fragrances, and in cosmetics as an ingredient for skin and hair care. It is considered safe for use in personal care products when used in appropriate concentrations, but it should be used with caution as high doses may be toxic. It's also recommended to consult with a qualified healthcare professional before using it.