Lemon balm leaf extract concentrates the leaves of *Melissa officinalis*, standardized for rosmarinic acid and other polyphenols. A small dose delivers more potency than teas or the dried herb.
People take it mainly for relaxation and calmness. Common reasons include easing occasional nervous tension, supporting restful sleep, or soothing mild digestive upset tied to stress.
Use it before stressful moments or at bedtime. You can take it with or without food, but follow the label for standardized extracts.
Caution: Lemon balm can interfere with thyroid medications, including levothyroxine, by blocking hormone absorption. It may also cause mild sedation, so watch your intake of alcohol or other sedatives.