Lemon Balm

Melissa officinalis

Family: Lamiaceae Part used: Leaves

Key Compounds

• Rosmarinic acid
• Luteolin
• Luteolin-7-glucoside
• Apigenin
• Apigenin-7-glucoside
• Caffeic acid
• Chlorogenic acid
• Ursolic acid
• Oleanolic acid
• Citronellal
• Linalool
• Geraniol
• Beta-caryophyllene

Traditional Use

• Anxiety and cognitive performance — multiple clinical trials showing reduction in anxiety and stress alongside simultaneous improvement in memory, attention, and processing speed; this combination is unusual in anxiolytic herbs, which typically produce a cognition-calm tradeoff
• Sleep support — traditionally and clinically used for sleep difficulty related to anxiety; the combination with valerian has two published RCTs supporting the combination over either herb alone for sleep quality
• Digestive antispasmodic — traditionally used across European herbalism for irritable bowel symptoms, digestive cramping, and nervous stomach; German Commission E approved for nervous agitation and sleep disorders including nervous gastric complaints
• Herpes simplex virus — rosmarinic acid has demonstrated antiviral activity against HSV-1 and HSV-2 in laboratory and topical clinical studies; topical creams containing lemon balm extract have been tested for oral herpes with positive results
• Carmelite Water — Eau de Mélisse des Carmes, a lemon balm distillate produced by Carmelite nuns in Paris since 1611; sold across Europe as a digestive tonic, headache remedy, and general restorative; still produced by the same Paris monastery
• Traditional apiary — 'Melissa' (Greek: bee) reflects the plant's strong attraction to honeybees; beekeepers traditionally rubbed hive interiors with fresh lemon balm to attract new swarms and encourage colonies to stay

The Greek name for the plant — melissa — means bee.

The genus name acknowledges what was the most notable thing about the plant to the Greeks: bees were attracted to it reliably and in quantity. Beekeepers across Europe rubbed fresh lemon balm inside hive interiors to attract swarms. A plant associated with bees was associated with industriousness, community, and sweetness — Melissa was also a common female name.

The medicinal use came alongside this. A plant that smells this clearly of lemon (brighter and cleaner than an actual lemon), that grows so easily, and that the bees like, is going to be used. And it was: documented in European herbal medicine from the classical period, prescribed by physicians through the medieval period, distilled by Carmelite nuns in Paris since 1611, and studied in clinical trials from the 1990s onward.

Meet the plant

A perennial herb, 30–80 cm, with wrinkled, broadly ovate leaves that smell unmistakably of lemon when bruised. The scent is clean, bright, slightly floral — more distinctly lemon-smelling than a lemon. It is in the Lamiaceae family: square stems, opposite leaves, labiate flowers. It grows easily in almost any temperate garden condition.

It is a common garden herb across Japan.

The bee plant and the nuns

The beekeeping connection is practical. Fresh lemon balm rubbed onto a hive interior — walls, entrance, frames — attracts scouts and encourages a swarm to take up residence. The same smell that humans perceive as clean and lemony communicates something useful to bees. What exactly is a question apiary science has not fully resolved.

The nuns of the Carmelite monastery in Paris (now Monastère des Carmes) began producing Eau de Mélisse des Carmes — Carmelite Water — in 1611. The formula combines lemon balm distillate with angelica, coriander, and other herbs. It was sold across Europe as a digestive tonic, headache remedy, and general restorative. The formula has been in continuous production since 1611 — over 400 years. It is still sold today.

This is one of the oldest continuously produced herbal preparations in the world, and it is still made by the same institution.

The cognitive paradox

Most calming herbs produce a tradeoff: anxiety goes down, alertness goes with it.

Lemon balm clinical trials have repeatedly found something different. In Kennedy et al. (2002, 2004), participants taking standardised lemon balm extract showed reduced anxiety and stress ratings alongside improved scores on memory, attention, and processing speed tasks. Calmer and sharper simultaneously. The same pattern appeared in subsequent trials by other researchers.

The mechanism makes pharmacological sense. Rosmarinic acid — the primary active compound — inhibits GABA-T (as valerian does) through one pathway and inhibits acetylcholinesterase (as the Alzheimer’s drug donepezil does, far more mildly) through another. Acetylcholinesterase breaks down acetylcholine, the neurotransmitter critical for memory and focused attention. By mildly slowing this breakdown, lemon balm increases acetylcholine availability while simultaneously supporting GABAergic calming.

More relaxed AND more attentive. This is why Paracelsus, the 16th-century physician-alchemist, reportedly drank lemon balm tea every morning and called it the elixir of life. He may have been exaggerating. He was describing a real effect.

The chemistry

Rosmarinic acid is the primary active compound — a phenolic ester found also in rosemary and sage, but at high concentrations in lemon balm. It drives the antiviral, anti-inflammatory, and GABA-modulating effects.

Luteolin and apigenin glycosides contribute antioxidant and mild anxiolytic activity.

Essential oil (citronellal, linalool, geraniol) is responsible for the characteristic lemon scent. The oil content is low (0.1–0.2% of dry leaf) but intensely fragrant.

What people actually do with it

Tea (most common): 1–2 teaspoons of fresh or dried leaves, steeped in hot water for 5–10 minutes. Fresh leaves have a brighter, more lemony flavour; dried leaves are more concentrated but slightly different in character. Drink 2–3 cups daily for calming effects, or a cup in the evening for sleep support.

Standardised extract: 300–600 mg daily of extract standardised to rosmarinic acid content. Used in the clinical trials showing cognitive and anxiety effects.

Combined with valerian: The most clinically supported combination for sleep. Two RCTs have found the combination significantly better than either herb alone for sleep quality.

Topical (for cold sores): Lemon balm cream standardised to rosmarinic acid has clinical evidence for reducing duration and severity of herpes labialis when applied at first sign. The antiviral mechanism against HSV is established in laboratory studies.

In cooking: Fresh lemon balm is used in European and Japanese cooking as a culinary herb — in salads, with fish, in cold drinks, in desserts. The flavour is distinctly lemon, milder and less acidic than lemon juice.

Could you grow this yourself?

Easily. Lemon balm grows enthusiastically in almost any condition — full sun, partial shade, poor soil, good soil. It self-seeds freely and spreads by rhizome. In Japan’s climate it grows from Hokkaido to Okinawa.

Harvest the leaves before flowering for highest compound content. The plant can be cut back to the ground and will regrow two or three times per season. Dry quickly at low temperatures or use fresh.

Note: lemon balm attracts bees. If you have a bee-free garden requirement, plant it away from seating areas.

Lemon balm (メリッサ) in Japan

Lemon balm is a common garden herb across Japan, available at garden centres as seedlings under the name レモンバーム or メリッサ. It is used in Japanese herb gardens primarily for its scent and culinary applications — teas, infused waters, cooking.

The medicinal supplement market is growing. Standardised lemon balm extract capsules are available at supplement retailers positioning the herb for anxiety, sleep, and cognitive support — the categories with the clinical evidence.

There is no traditional Japanese medicinal relationship with lemon balm. It is not a kampo ingredient and has no classical Japanese name. The introduction has been entirely through the garden and supplement channels. The cognitive-calm combination appeals to Japanese consumers looking for study and performance support without the stimulating edge of caffeine or the sedating weight of prescription anxiolytics.

Things you’re probably wondering

Why does it improve cognition AND reduce anxiety? Rosmarinic acid inhibits both GABA-T (increasing GABA for calming) and acetylcholinesterase (increasing acetylcholine for cognitive function) through different mechanisms simultaneously. The result is a state that is calmer and more cognitively effective.

What is Carmelite Water? A distilled lemon balm preparation produced by Carmelite nuns in Paris since 1611 — still in production today. One of the oldest continuously produced herbal preparations in the world.

Is it effective for cold sores? Topical lemon balm cream has positive clinical evidence for herpes labialis. The antiviral mechanism of rosmarinic acid against HSV is established in laboratory studies.

Does it grow in Japan? Yes — readily. Common garden herb throughout Japan.

Botanical details

The full compound list

See Also

• Valerian — commonly combined with lemon balm for sleep; two RCTs support the combination
• Chamomile — another gentle nervine; apigenin-based GABA modulation
• Ashwagandha — adaptogen with similar cognitive-and-calm profile; different mechanism, longer build time

References

• Kennedy, D.O. et al. (2002). Modulation of mood and cognitive performance following acute administration of Melissa officinalis. Pharmacology, Biochemistry and Behavior, 72(4), 953–964.
• Kennedy, D.O. et al. (2004). Attenuation of laboratory-induced stress in humans after acute administration of Melissa officinalis. Psychosomatic Medicine, 66(4), 607–613.
• Cases, J. et al. (2011). Pilot trial of Melissa officinalis L. leaf extract in the treatment of volunteers suffering from mild-to-moderate anxiety disorders. Mediterranean Journal of Nutrition and Metabolism, 4(3), 211–218.
• Koytchev, R. et al. (1999). Balm mint extract (Lo-701) for topical treatment of recurring herpes labialis. Phytomedicine, 6(4), 225–230.