Home / Ingredient Directory / Lemon Balm

Reviewed by Yannis Lopez · Nutrition Industry Veteran

Last updated: October 30, 2026

Sleep & Relaxation Traditional Herb

Lemon Balm

A calming mint-family herb studied for stress, anxiety, and sleep

Calmness shown in placebo-controlled trials

Dose matters more than most people expect

Important: These statements have not been evaluated by the FDA. This information is not intended to diagnose, treat, cure, or prevent any disease. Always consult your physician before starting any supplement.

Overview

Lemon balm (Melissa officinalis) is a lemon-scented member of the mint family that has long been used as a mild sedative and calming herb. A 2018 systematic review included it among ten plant medicines with both lab evidence of GABA-system activity and human clinical trials, alongside kava, valerian, passionflower, and chamomile.

The human research is encouraging but modest. Many of the best-known studies are single-dose lab experiments in small groups of healthy volunteers, while the longer trials are few and varied. A 2021 meta-analysis found that lemon balm improved anxiety and depression scores compared with placebo, but the authors cautioned that results varied widely between studies. One consistent surprise across the research is that dose matters: more was not always better.

What the Research Shows

Calm Under Stress

In a double-blind crossover trial of 18 healthy volunteers, a 600mg dose of standardized extract improved calmness and eased the negative mood effects of a laboratory stress test.

Anxiety & Depression Scores

A 2021 meta-analysis of randomized trials found lemon balm lowered anxiety and depression scores compared with placebo without serious side effects, with high heterogeneity between studies.

Sleep Support

An open-label pilot (20 volunteers, 15 days) reported large drops in insomnia scores, though it had no placebo group. A placebo-controlled trial in 80 angina patients found 3g/day for 8 weeks reduced sleep disturbance.

Mixed Effects on Focus

A 1,600mg dose of dried leaf improved memory performance and calmness in 20 volunteers, but lower doses slowed some timed memory tasks. It is a calming herb, not a focus aid.

Doses Studied

Standardized Extract

300–600mg

Single doses in the lab stress trial. The 600mg dose improved calmness; the 300mg dose sped up mental arithmetic.

Longer-Term (One Trial)

3g daily

Used for 8 weeks in patients with chronic stable angina. Not a general-purpose recommendation.

Pro Tips

More is not better: a lemon balm and valerian combination eased anxiety at 600mg, but the highest dose (1,800mg) increased it and all doses slowed performance on a Stroop attention task
It can lower alertness as well as raise calm, so test how you respond before driving or doing anything that needs sharp focus
Do not stack it with sedatives or sleep medications without asking your doctor or pharmacist
Tea is a gentle way to try it, but the trials used extracts and capsules, so tea strength is not equivalent to the studied doses. If you are pregnant or managing a medical condition, check with your clinician

Research Snapshot

A 2021 systematic review and meta-analysis of randomized clinical trials found that lemon balm significantly improved anxiety scores (SMD -0.98, 95% CI -1.63 to -0.33) and depression scores (SMD -0.47, 95% CI -0.73 to -0.21) compared with placebo, without serious side effects. The authors noted high heterogeneity, a small number of trials, and differing methods, and called for more high-quality studies.

Source: Ghazizadeh et al., Phytotherapy Research (2021)

How Lemon Balm Compares

Ingredient	Best For	Key Difference
Lemon Balm	Acute Calm & Stress	Mild calming herb; best evidence is from single-dose stress tests and a few small trials
Chamomile	Gentle Relaxation	More research on extracts for generalized anxiety; very popular as a bedtime tea
Valerian Root	Sleep Onset	Generally a stronger sedative effect; often sold combined with lemon balm
Passionflower	Anxiety & Sleep	Another GABA-active herb with its own human trials
L-Theanine	Calm Focus	Relaxation without sedation; often used during the day

Popular Pairings with Lemon Balm

Evening Tea

Lemon Balm + Chamomile

A traditional, low-key wind-down drink

Lemon Balm + Valerian

Lemon Balm + Valerian Root

Commonly sold together; the one trial found a mid dose worked and a high dose backfired

A Note on Combining

Check with your doctor before combining it with sedatives or sleep aids

Calming herbs can add to each other's effects

Frequently Asked Questions

Does lemon balm help with anxiety?

A 2021 meta-analysis of randomized trials found lemon balm lowered anxiety scores compared with placebo, and a lab stress trial found a 600mg dose improved calmness. The trials were small and varied a lot, so the evidence is encouraging but not conclusive.

Can lemon balm help you sleep?

There is some support. An open-label pilot study reported big improvements in insomnia scores, and a placebo-controlled trial in 80 patients with chronic stable angina found 3g daily for 8 weeks reduced sleep disturbance. Neither is enough to call it proven for general sleep problems.

How much lemon balm should I take?

Studied single doses of standardized extract were 300 to 600mg, and a longer trial used 3g daily for 8 weeks. Dose matters: in a lemon balm and valerian combination trial, the highest dose increased anxiety instead of reducing it.

Is lemon balm tea strong enough to work?

Tea is a pleasant, low-risk way to try it, but the trials used extracts and capsules, so tea strength is not equivalent to the studied doses. Expect a mild effect at most.

Can I take lemon balm with valerian or other sleep aids?

They are commonly sold together, and one trial found a 600mg combination dose reduced laboratory-induced anxiety while a higher dose did not. Because calming herbs and sedatives can add up, check with your doctor or pharmacist before combining them with sleep medications.

Sources & References

1. Ghazizadeh J et al. (2021). The effects of lemon balm (Melissa officinalis L.) on depression and anxiety in clinical trials: a systematic review and meta-analysis. Phytotherapy Research, 35(12), 6690–6705.

2. Savage K et al. (2018). GABA-modulating phytomedicines for anxiety: a systematic review of preclinical and clinical evidence. Phytotherapy Research, 32(1), 3–18.

3. Kennedy DO et al. (2004). Attenuation of laboratory-induced stress in humans after acute administration of Melissa officinalis (lemon balm). Psychosomatic Medicine, 66(4), 607–613.

4. Kennedy DO et al. (2003). Modulation of mood and cognitive performance following acute administration of single doses of Melissa officinalis (lemon balm) with human CNS nicotinic and muscarinic receptor-binding properties. Neuropsychopharmacology, 28(10), 1871–1881.

5. Kennedy DO et al. (2006). Anxiolytic effects of a combination of Melissa officinalis and Valeriana officinalis during laboratory induced stress. Phytotherapy Research, 20(2), 96–102.

6. 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 and sleep disturbances. Mediterranean Journal of Nutrition and Metabolism, 4(3), 211–218.

7. Haybar H et al. (2018). The effects of Melissa officinalis supplementation on depression, anxiety, stress, and sleep disorder in patients with chronic stable angina. Clinical Nutrition ESPEN, 26, 47–52.

All references are peer-reviewed studies indexed in PubMed.