NutriDex

The Supplement Research Compendium
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Lemon Balm

Melissa officinalis

Calming mint-family herb for mild anxiety, stress and sleep.

Moderate evidence 🌙Sleep & Mood🧠Nootropic

✚ Updated · How we grade evidence

Evidence tier
Moderate
Research weight
Citations
8 verified / 8
Classification
Sleep & Mood
❝
What the evidence says. Graded moderate: a 2021 meta-analysis and several RCTs show real short-term reductions in anxiety, depression and insomnia scores, but trials are small, brief (often ≤8 weeks), heterogeneous and frequently industry-linked, and long-term efficacy is unproven. (Moderate evidence: Several controlled trials; effects real but modest or context-dependent.)

What is Lemon Balm?

Lemon Balm (Melissa officinalis) is a sleep and mood supplement used for ease mild anxiety & stress. NutriDex grades the human evidence as Moderate. Lemon balm is a lemon-scented mint-family herb used for centuries as a mild calmative. A 2021 systematic review and meta-analysis found it reduced anxiety (SMD ≈ -0.98) and depression (SMD ≈ -0.47) scores versus placebo, though heterogeneity was high. Small acute-dosing trials in healthy adults show increased self-rated calmness and some memory benefit at 600–1600 mg. Recent placebo-controlled crossover trials of standardized phytosome extracts (~400 mg) report lower Insomnia Severity Index scores and more slow-wave sleep. A 2-week RCT also reduced benign heart-palpitation episodes and anxiety. Meta-analyses suggest modest drops in triglycerides, total cholesterol and LDL. Overall the effects are real but small, the trials short and varied in extract and dose, and a 96-week cognition RCT in older adults was essentially negative — so lemon balm is best seen as a gentle adjunct, not a treatment.

Purported Benefits

✓Ease mild anxiety & stress
✓Improve sleep quality
✓Lift low mood
✓Calmness without strong sedation
✓Modest lipid lowering

Evidence by outcome

The same supplement can be well-proven for one use and unproven for another — here is the human evidence graded outcome by outcome.

OutcomeEvidenceEffectStudies
Anxiety & stress reductionMeta-analysis showed large anxiety reduction (SMD ~-0.98) but high heterogeneity and short, varied trials. Preliminary ↑ benefit · moderate 1
Sleep quality / insomniaSmall crossover RCT of 400 mg phytosome cut Insomnia Severity Index and raised slow-wave sleep; n=30. Preliminary ↑ benefit · moderate 1
Low mood / depressionSame meta-analysis found a smaller depression effect (SMD ~-0.47); evidence limited and heterogeneous. Preliminary ↑ benefit · small 1
Acute calmness in healthy adultsAcute-dosing crossover RCTs raised self-rated calmness, though highest doses reduced alertness. Preliminary ↑ benefit · small 2
Lipid lowering (cholesterol/triglycerides)Two meta-analyses show modest TG/TC/LDL drops, limited by few studies and high bias risk. Preliminary ↑ benefit · small 2
Cognition in older adults96-week RCT (n=323) was essentially negative overall, with only a non-hypertensive subgroup signal. Moderate — no effect · negligible 1

Dosing & Compounds

Typical Dose
300–600 mg of standardized leaf extract for acute calming, or 600–1200 mg/day (often as phospholipid/phytosome forms, ~200–500 mg) for sleep and mood over weeks.
Active Compounds
Rosmarinic acidTriterpenes (ursolic/oleanolic acid)Citral & citronellal (volatile oil)Flavonoids

Safety & Cautions

Generally well tolerated short-term; mild side effects include drowsiness, nausea, dizziness and headache. Because it is sedating, it may add to the effects of alcohol, benzodiazepines, barbiturates and other CNS depressants, and could compound the action of antidiabetic and lipid-lowering drugs. Some evidence suggests it can affect thyroid signalling, so caution is advised with thyroid disease or levothyroxine. Avoid before surgery (it may interact with anesthesia) and use cautiously in pregnancy or breastfeeding given limited safety data. Educational only — always check with your doctor or pharmacist before combining Lemon Balm with any medicine.

Lemon Balm drug interactions

Known or theoretical interactions between Lemon Balm and common medications — educational, not exhaustive. Always check with your doctor or pharmacist before combining Lemon Balm with any medicine.

Monitor
Benzodiazepines, sleep medicines & alcohol
May add to drowsiness and sedation when taken with sleep medicines, benzodiazepines or alcohol.
Lemon balm has mild sedative, GABAergic activity that may compound the effect of CNS-depressant drugs. NIH LiverTox — Lemon Balm (Melissa officinalis)

Key Studies

Meta-analysis Shahsavari 2024 ✓ PubMed
Meta-analysis (5 RCTs, n=302): reduced triglycerides (SMD -0.40), total cholesterol (SMD -0.42) and LDL (SMD -0.23) vs placebo.
Meta-analysis Ghazizadeh 2021 ✓ PubMed
Meta-analysis: lemon balm reduced anxiety (SMD -0.98, 95% CI -1.63 to -0.33) and depression (SMD -0.47, -0.73 to -0.21) scores.
Meta-analysis Heshmati 2020 ✓ Full text
Systematic review/meta-analysis of RCTs: significant reductions in total cholesterol and systolic BP; limited by few studies and high bias risk.
RCT Di Pierro 2024 ✓ PubMed
Crossover RCT (n=30, insomnia): 400mg phytosome cut Insomnia Severity Index (6.8 vs 9.7, p=0.003) and raised slow-wave sleep ~15%.
RCT Noguchi-Shinohara 2023 ✓ PubMed
96-week RCT (n=323, older adults): no overall cognitive benefit; a subgroup signal in non-hypertensive participants (CDR-SB, p=0.036).
RCT Alijaniha 2015 ✓ PubMed
2-week RCT (n=55, benign palpitations): 1000mg/day extract reduced palpitation episodes and the number of anxious patients vs placebo.
RCT Kennedy 2003 ✓ PubMed
Acute crossover RCT (n=20, healthy): single 1600mg dose improved memory and raised self-rated 'calmness' at all post-dose timepoints.
RCT Kennedy 2002 ✓ PubMed
Acute crossover RCT (n=20): 600mg improved attention accuracy; calmness rose at lowest dose, alertness fell at highest dose.
8 sources cited · 8 verified Search all studies on PubMed ↗

Common questions about Lemon Balm

What is Lemon Balm used for?

Lemon Balm is most often taken for Ease mild anxiety & stress, Improve sleep quality, Lift low mood, Calmness without strong sedation. Calming mint-family herb for mild anxiety, stress and sleep.

Does Lemon Balm work — what does the evidence say?

Moderate evidence. Several controlled trials; effects real but modest or context-dependent. Lemon balm is a lemon-scented mint-family herb used for centuries as a mild calmative. A 2021 systematic review and meta-analysis found it reduced anxiety (SMD ≈ -0.98) and depression (SMD ≈ -0.47) scores versus placebo, though heterogeneity was high. Small acute-dosing trials in healthy adults show increased self-rated calmness and some memory benefit at 600–1600 mg. Recent placebo-controlled crossover trials of standardized phytosome extracts (~400 mg) report lower Insomnia Severity Index scores and more slow-wave sleep. A 2-week RCT also reduced benign heart-palpitation episodes and anxiety. Meta-analyses suggest modest drops in triglycerides, total cholesterol and LDL. Overall the effects are real but small, the trials short and varied in extract and dose, and a 96-week cognition RCT in older adults was essentially negative — so lemon balm is best seen as a gentle adjunct, not a treatment.

What is the typical dose of Lemon Balm?

300–600 mg of standardized leaf extract for acute calming, or 600–1200 mg/day (often as phospholipid/phytosome forms, ~200–500 mg) for sleep and mood over weeks.

Is Lemon Balm safe? Any cautions or side effects?

Generally well tolerated short-term; mild side effects include drowsiness, nausea, dizziness and headache. Because it is sedating, it may add to the effects of alcohol, benzodiazepines, barbiturates and other CNS depressants, and could compound the action of antidiabetic and lipid-lowering drugs. Some evidence suggests it can affect thyroid signalling, so caution is advised with thyroid disease or levothyroxine. Avoid before surgery (it may interact with anesthesia) and use cautiously in pregnancy or breastfeeding given limited safety data.

How many studies support Lemon Balm?

NutriDex cites 8 sources for Lemon Balm, graded "Moderate".

Does Lemon Balm interact with any medications?

Yes — known or theoretical interactions include: Sedatives (benzodiazepines, opioids, alcohol) (monitor). This is educational and not exhaustive; always check with your doctor or pharmacist before combining Lemon Balm with any medicine.

Cite this page
APA

Peh, D. (2026). Lemon Balm (Melissa officinalis): Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 26 Jun 2026, from https://nutridex.info/s/lemon-balm

BibTeX
@misc{nutridex_lemon_balm,
  author       = {Peh, Daryl},
  title        = {Lemon Balm (Melissa officinalis): Benefits, Dosage, Side Effects \& Evidence},
  year         = {2026},
  howpublished = {NutriDex --- The Supplement Research Compendium},
  url          = {https://nutridex.info/s/lemon-balm},
  note         = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-06-26}
}

For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.

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