Considered the gentler cousin of peppermint, spearmint essential oil is extracted from the flowering tops of the perennial herb native to the moist Mediterranean region. The colorless oil has a light consistency and emits a minty, sweet scent. When added to massage oil, spearmint oil has antispasmodic properties that can help relieve muscle pain and menstrual cramps. It is also often used in aromatherapy to help those suffering from headaches, fatigue, and stress.