How to Use Lemon Balm for Anxiety

Lemon balm (Melissa officinalis) can be used for anxiety as a tea, a capsule or liquid extract, or an inhaled essential oil, and clinical trials across these forms have found it reduces self-reported anxiety compared to placebo. A 2021 meta-analysis of clinical trials found that lemon balm significantly improved anxiety scores, with the strongest effects seen in acute, short-term use.¹ The herb is easy to grow, widely available as a supplement, and generally well tolerated, but the way you prepare it and the dose you choose matter more than most people realize.

How Lemon Balm Affects the Brain

The calming effect of lemon balm traces to its phytochemicals, particularly rosmarinic acid, which interact with several systems in the brain. The best-studied mechanism involves a neurotransmitter called GABA, which acts as the brain’s main brake pedal for neural activity. Lemon balm inhibits the enzyme that breaks GABA down, effectively letting more of it stay active in the brain for longer. In lab testing, the water-based extract of lemon balm showed the strongest inhibition of that enzyme among several traditional anxiety herbs tested.² This is the same general pathway that benzodiazepine medications target, though lemon balm works on it far more gently.

GABA is not the whole picture. Research on animal models and cell cultures suggests lemon balm also influences cholinergic pathways (involved in memory and attention) and serotonergic signaling (involved in mood regulation).³ One early study measured lemon balm’s ability to bind to nicotinic and muscarinic receptors in human brain tissue, finding that while the binding did occur, it was relatively weak compared to some other botanicals.⁴ So the anxiety relief likely comes from multiple mild effects stacking on top of each other rather than from a single powerful action on one receptor.

What Clinical Trials Actually Show

The clinical evidence for lemon balm and anxiety is encouraging, though the field is honest about its limitations. The most comprehensive look comes from a systematic review and meta-analysis that pooled results from clinical trials and found lemon balm significantly reduced both anxiety and depression scores compared to placebo. The effect on anxiety was larger than the effect on depression, and acute use (single-dose or short-course studies) tended to show more dramatic results than longer trials.¹ The authors cautioned that heterogeneity between studies was high, meaning the trials used different doses, forms, and populations, making the pooled result somewhat rough.

Individual trials give a clearer sense of what the experience looks like. In one well-known lab-based study, volunteers who took a 600 mg dose of lemon balm extract before being subjected to a standardized psychological stress test reported feeling significantly calmer and showed reduced negative mood effects compared to placebo. The tradeoff was a mild reduction in alertness.⁵ That finding captures what many users report anecdotally: lemon balm takes the edge off without knocking you out, though high doses can make you feel a bit drowsy.

A longer trial looked at people with type 2 diabetes who also had depression and anxiety. Over 12 weeks of daily lemon balm supplementation, anxiety and depression scores dropped significantly in the treatment group compared to placebo.⁶ This trial is worth noting because it studied people dealing with a chronic health condition on top of their psychological symptoms, which is closer to real-world use than a stress test in a laboratory.

Tea, Capsules, or Essential Oil

You can use lemon balm in three main forms, each with different practical considerations and slightly different evidence behind it.

Tea is the most traditional preparation and the easiest starting point. You steep dried or fresh lemon balm leaves in hot water, drink it, and absorb the active compounds through your gut. Most of the GABA-related research used water-based extracts, which is essentially what tea is. If you grow your own or buy loose-leaf lemon balm, a standard dose is roughly one to two tablespoons of dried leaves (or a generous handful of fresh ones) per cup, steeped for five to ten minutes in water that has just boiled. The ritualistic element of making tea may also contribute to the calming effect, though that is hard to separate from the pharmacology in everyday use.

Capsules and liquid extracts are more standardized and easier to dose consistently. Clinical trials have used doses ranging from around 300 mg to 1600 mg of dried extract. The 600 mg dose is the one that showed clear anxiety-reducing effects in the laboratory stress study cited above.⁵ One commercial standardized extract (sold under the brand name Cyracos) has been tested in a study of volunteers with mild-to-moderate anxiety and sleep disturbances over 15 days, and that product was specifically standardized for the compounds believed to inhibit GABA breakdown.⁷ If you go the capsule route, look for products that list their rosmarinic acid content or use a standardized extract, since the amount of active compounds in generic dried-leaf capsules varies widely.

Essential oil inhalation works through a different route. You breathe in volatile compounds that reach the brain rapidly through the olfactory system. In a trial with patients experiencing acute coronary syndrome in an emergency department, inhaling lemon balm essential oil led to a significant decrease in self-reported stress and heart rate at measured time points compared to a placebo scent.⁸ Another trial found that inhaling lemon balm oil reduced perceived stress in women undergoing fertility treatments.⁹ A trial in hemodialysis patients who inhaled lemon balm oil three times a week for a month found significant reductions in both state and trait anxiety compared to a control group. The aromatherapy group also experienced improvements in several physical symptoms, including nausea and muscle cramps.¹⁰ For home use, a few drops of genuine Melissa essential oil in a diffuser or on a tissue held near the nose is the typical approach. Be aware that true Melissa oil is expensive because the plant yields very little essential oil; cheap “lemon balm oil” is often adulterated with lemongrass or citronella.

How You Brew Your Tea Matters

If tea is your preferred form, the way you prepare it makes a meaningful difference in how much of the active compounds end up in your cup. A study comparing brewing methods found that steeping mature lemon balm leaves in hot water (boiled, around 100°C) for five minutes produced tea with the highest levels of total phenolics, total flavonoids, rosmarinic acid, and antioxidant capacity. Cold-brewed tea, made by steeping leaves in room-temperature water for two hours, contained lower amounts of these compounds. Teas made from microgreen-stage lemon balm (very young plants) also had lower phenolic content than those made from fully grown adult plants, though the microgreen teas were richer in minerals like calcium, magnesium, and potassium.¹¹

The practical takeaway: use fully mature leaves and brew them hot. If you are growing your own lemon balm, harvest when the plant is well established, not from seedling trays. And if you have been making cold lemon balm iced tea and wondering why it does not seem to do much, the brewing temperature may be part of the answer. You can always brew hot and then chill the tea over ice if you prefer it cold.

Combining Lemon Balm with Other Herbs

Lemon balm is frequently paired with valerian root in commercial supplements and in traditional herbal practice. A study in children under 12 who were experiencing restlessness and sleep difficulties found that a combined valerian-lemon balm preparation produced a clear reduction in symptom severity. Most of the children moved from moderate or severe symptoms to mild or absent ratings, and the combination was well tolerated.¹² This is one of the few studies specifically looking at herbal anxiety-related treatments in a pediatric population, which makes it particularly useful for parents wondering about options for anxious kids.

A broader review of medicinal plants for insomnia related to anxiety ranked valerian, passionflower, and ashwagandha as the three botanicals with the strongest clinical support. The combination of valerian with hops and passionflower showed the best results in clinical testing for sleep-related anxiety.¹³ Lemon balm did not top that particular ranking, which is a useful reality check. For daytime anxiety where you want to stay relatively alert, lemon balm on its own or with a mild companion herb may be preferable. For nighttime anxiety that is disrupting sleep, a valerian-lemon balm blend or the valerian-hops-passionflower combination has more targeted evidence.

Safety, Side Effects, and Who Should Be Careful

Lemon balm is generally well tolerated. The meta-analysis noted above found no serious side effects across the studies it reviewed.¹ The most commonly reported effect is mild drowsiness, especially at higher doses, which is worth knowing if you plan to take it before driving or working. Some people experience mild gastrointestinal discomfort.

There are a few groups who should exercise more caution:

Thyroid conditions: Lemon balm has been identified as one of several herbs that can modulate thyroid hormone synthesis.¹⁴ This has been explored as a potential benefit for people with an overactive thyroid, but it means anyone on thyroid medication or with hypothyroidism should talk to their doctor before regular use. Occasional tea is unlikely to cause problems, but daily high-dose supplementation is a different story.
Pregnancy: Limited scientific evidence exists to establish the safety of lemon balm during pregnancy.¹⁵ It is one of the herbs commonly used by pregnant women in some cultures, but “commonly used” and “proven safe” are not the same thing. The honest answer is that we do not have enough data to say it is safe at supplemental doses during pregnancy.
Sedative medications: Because lemon balm enhances GABA activity, it could theoretically amplify the effects of sedative drugs, benzodiazepines, or sleep medications. The interaction has not been studied in formal drug-interaction trials, but the mechanism makes it plausible, and caution is reasonable.

Why Acute and Chronic Use May Feel Different

One of the more interesting findings from the research is the suggestion that lemon balm’s anti-anxiety effects are strongest in acute, short-term use. The meta-analysis noted this pattern, and it aligns with the lab-based stress studies, where single doses taken before a stressor produced clear results.¹ The 12-week diabetes trial did find sustained benefits,⁶ so it is not that long-term use does nothing. Rather, the effect size may be most noticeable when you use lemon balm situationally rather than as a daily background supplement.

This has practical implications. If you are looking for something to take before a presentation, a dentist appointment, or a stressful flight, a 600 mg extract taken 30 to 60 minutes beforehand aligns with how the acute studies were designed. If you are looking for daily support for generalized anxiety, a lower dose as part of a broader routine (alongside sleep, exercise, and other interventions) is more realistic, and you should keep expectations modest. Lemon balm is not a replacement for therapy or medication in moderate-to-severe anxiety disorders. It is better thought of as one tool in a larger toolkit, and the evidence is honest about how much it can and cannot do.

Cognitive Effects and the Alertness Tradeoff

Lemon balm’s effects extend beyond simple anxiety reduction into cognitive territory. In a study testing single doses, the highest dose (1600 mg) improved memory performance and increased self-rated calmness across all time points measured after dosing. The researchers suggested lemon balm could be valuable in treating conditions involving cognitive decline, particularly Alzheimer’s disease.¹⁶ That is a long way from proven, but the finding highlights something useful for everyday users: at moderate doses, lemon balm may improve your ability to focus and remember things while simultaneously calming you down.

The catch is the alertness question. The 600 mg stress study found that calmness came with reduced alertness.⁵ This creates a dose-dependent balancing act. A lower dose may calm you enough to focus better without making you drowsy, while a higher dose may cross the line into sedation. If you are using lemon balm to help with work-related anxiety, starting at the lower end and adjusting upward is a sensible approach. Save the higher doses for evenings or weekends when drowsiness is not an issue.

Growing Your Own

Lemon balm is one of the easiest herbs to grow, sometimes aggressively so. It is a perennial in the mint family that spreads readily through runners and self-seeding, so much so that experienced gardeners often recommend growing it in containers to prevent it from taking over a bed. It thrives in partial shade to full sun and tolerates a wide range of soils.

If you are growing lemon balm specifically for its anxiety-related compounds, the research on cultivation methods offers some useful guidance. A comparison of hydroponic and soil-based growing found that all methods produced similar yields, but soil-grown plants had higher levels of total phenolic acids and rosmarinic acid, the compounds most closely linked to the GABA mechanism. Soilless systems (perlite and aeroponic) reduced rosmarinic acid content while boosting other compounds like caffeic acid.¹⁷ For a home grower focused on maximizing the calming properties, a simple pot of soil-grown lemon balm on a patio is a better bet than a hydroponic setup.

Harvest the leaves just before the plant flowers, when the concentration of essential oils and phenolic compounds tends to peak. You can use them fresh or dry them in a single layer in a warm, well-ventilated spot away from direct sunlight. Dried leaves will keep their potency for roughly a year in a sealed, opaque container. If you end up with more lemon balm than you can use, which is a common problem given how enthusiastically the plant grows, dried leaves also make pleasant sachets for drawers and closets, giving you a mild aromatherapy effect in passing.