Lemon balm aerial parts extract concentrates the leaves of *Melissa officinalis* into a capsule or liquid. Most preparations standardize for rosmarinic acid content. Many people reach for it to calm a busy mind and ease into deeper sleep, especially before bed or during stressful stretches.
Expect drowsiness after taking it. If you use thyroid medication, the two can interact, so handle the timing carefully. Stop and speak with a doctor if you have concerns.