Lemon balm leaf extract

What is lemon balm?

Lemon balm (Melissa officinalis) is a lemon-scented herb in the mint family, native to southern Europe and the Mediterranean. It has been used since the Middle Ages to lift mood, calm nerves, aid sleep and settle the stomach. The leaves contain rosmarinic acid, flavonoids and volatile oils such as citral, which are thought to contribute to its calming effects, possibly by influencing GABA, a signaling chemical in the brain.

In digestive products, lemon balm is usually included for its traditional use against “nervous stomach,” the kind of discomfort that tends to flare with stress.

What the research says

Most clinical research on lemon balm focuses on mood. A 2021 systematic review and meta-analysis in Phytotherapy Research pooled randomized trials of lemon balm in people with symptoms of anxiety or depression. Compared with placebo, lemon balm significantly improved average anxiety and depression scores without serious side effects. The authors cautioned that the trials were few, used different methods and showed high heterogeneity, so the results should be interpreted carefully and confirmed in higher-quality studies.

For digestion specifically, lemon balm is usually tested as part of multi-herb formulas, so it is hard to isolate its contribution. There is no strong direct evidence that lemon balm on its own reduces bloating or improves gut health in healthy adults.

We rate the evidence as limited: promising for short-term anxiety and mood support, and unproven as a stand-alone digestive aid.

How it’s used in supplements

Lemon balm is sold as tea, tincture, capsules and standardized extracts, often combined with valerian, chamomile or passionflower for sleep and relaxation. Trials have used a range of doses, commonly a few hundred milligrams of extract daily. It is generally well tolerated; reported side effects are mild and may include nausea, dizziness or abdominal discomfort. Because it may cause drowsiness, use caution when combining it with sedative medications or alcohol. People with thyroid conditions are often advised to check with a doctor, since lab research suggests lemon balm may affect thyroid hormone activity.

In PrimeBiome, lemon balm leaf extract is part of a 430 mg proprietary blend shared with eight other ingredients, so its amount is unknown and likely below the doses used in mood studies.

For people who want to try lemon balm for stress-related stomach upset, a cup of lemon balm tea or a single-herb extract with a stated dose is a more transparent way to test it. Give any change a few weeks, and keep notes so you can tell whether it is making a real difference.