Ingredient guide
Lemon balm is a mint-family herb used for calm, mild stress, and sleep. Small trials suggest it can ease feelings of stress and improve sleep quality. The human evidence is limited and the trials are small.
Limited evidenceLemon balm is a lemon-scented herb in the mint family, known by its botanical name Melissa officinalis. People have used it for centuries as a calming tea. The supplement is made from the leaves, and its studied compounds include rosmarinic acid. You will find it on its own and inside sleep and stress blends, often paired with valerian.
Laboratory work suggests lemon balm influences several brain signalling systems, including the GABA pathway that the body uses to wind down. That is a plausible route for a calming effect. As with most herbs, the mechanism is clearer in the test tube than in the messy reality of a human brain.
Several small trials are encouraging. Studies report that lemon balm can ease feelings of stress and emotional tension and can improve self-rated sleep quality, with the sleep effect often stronger when it is combined with valerian. Some research also hints at small benefits for mood and mental clarity.
The limits are familiar. The trials are small, short, and use different extracts and doses, so it is hard to be confident. We grade the human evidence as limited. Lemon balm is a gentle, generally safe option for everyday tension and sleep, but it is not a proven answer for a diagnosed condition, which deserves proper care.
Lemon balm is used as a tea or a standardised extract, often 300 mg to 600 mg per day, with an evening dose for sleep. It is gentle, but because it can add to sedation, it is best kept away from alcohol and sedative medicine. If you take sedatives or have a thyroid condition, check with your healthcare provider before regular use.
Trials vary widely, often using 300 mg to 600 mg of standardised extract per day, sometimes split into two doses, or as a tea. There is no single agreed dose. For sleep it is taken in the evening. Ask your healthcare provider before regular use if you take sedatives or thyroid medicine.
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Some small trials show better self-rated sleep quality, often when lemon balm is combined with valerian. Taken in the evening, it may help wind you down.
It is generally well tolerated. The main cautions are added drowsiness with alcohol or sedatives, and a possible effect on thyroid function.
Trials use a wide range, often 300 to 600 mg of standardised extract per day, or as a tea. There is no single official dose.