Lemon Balm
Melissa officinalis
TL;DR
Lemon balm has small, consistent trials showing reduced anxiety and improved sleep quality, usually at 300-600 mg/day of standardised extract. The evidence base is genuinely small, but the safety profile is excellent and effects are noticeable within hours rather than weeks.
Ideal For
- Situational stress and restlessness
- Difficulty winding down in the evening
- Mild sleep-onset difficulty
- People wanting something gentler than valerian
Avoid If
- Hypothyroidism, given antithyroid activity in laboratory studies
- Taking sedatives or thyroid medication without advice
- Pregnancy or breastfeeding
- Two weeks before surgery, with anaesthesia
Frequently Asked Questions
Overview
Lemon balm sits in the useful middle ground of gentle, fast-acting and well tolerated. Its trials are small — typically dozens rather than hundreds of participants — but they point consistently in the same direction: reduced anxiety and stress ratings, improved subjective sleep quality, and in some studies improved calmness and alertness measured together, which is an unusual combination. It has been studied both alone and in combination with valerian, where the pair performed reasonably in sleep-disturbed children and adults. There is also a small literature on palpitations and on cognitive performance under stress. What lemon balm is not is a treatment for a diagnosed anxiety disorder; for that, oral lavender has far stronger evidence. Where it fits is situational stress, evening wind-down and mild restlessness, where a mild GABAergic nudge with essentially no next-day impairment is exactly the right dose of intervention. A single practical caution is worth noting: it has antithyroid activity in laboratory work and should be approached carefully in hypothyroidism.
How It Works
- Rosmarinic acid inhibits GABA transaminase, raising GABA levels
- Weak acetylcholinesterase inhibition, relevant to cognition
- Binds nicotinic and muscarinic receptors
- Mild spasmolytic action in the gut
Quick Facts
- Works within hours, not weeks
- Raises GABA by blocking its breakdown
- Trials are small but consistent
- Antithyroid activity means caution in hypothyroidism
Benefits & Outcomes
No linked outcomes yet. Research is ongoing.
Supporting Research6 studies
The effects of lemon balm (Melissa officinalis L.) on depression and anxiety in clinical trials: A systematic review and meta-analysis
Ghazizadeh J, Sadigh-Eteghad S, Marx W
Lemon balm significantly reduced anxiety and depression scores compared with placebo, without serious adverse effects.
Effect of Melissa officinalis on anxiety, depression and sleep disturbance in patients with chronic stable angina
Haybar H, Javid AZ, Haghighizadeh MH
Melissa officinalis 3 g/day for eight weeks significantly reduced anxiety, depression, stress and sleep disturbance versus placebo.
Heart palpitation relief with Melissa officinalis leaf extract: double blind, randomized, placebo controlled trial of efficacy and safety
Alijaniha F, Naseri M, Afsharypuor S
Lemon balm extract reduced the frequency of benign palpitation episodes and associated anxiety compared with placebo.
Attenuation of laboratory-induced stress in humans after acute administration of Melissa officinalis
Kennedy DO, Little W, Scholey AB
A single dose of Melissa officinalis increased self-rated calmness during a laboratory stressor, with task performance impaired at the higher dose.
Anti-stress effects of lemon balm-containing foods
Scholey A, Gibbs A, Neale C
Lemon balm-containing foods improved mood and cognitive performance following a psychological stressor.
Pilot trial of Melissa officinalis L. leaf extract in the treatment of volunteers suffering from mild-to-moderate anxiety disorders and sleep disturbances
Cases J, Ibarra A, Feuillere N
Anxiety manifestations decreased by 18% and insomnia by 42% after 15 days of a standardised Melissa officinalis extract.
Safety Information
Potential Side Effects
Very well tolerated. Mild sedation, nausea, dizziness and headache occur occasionally, mostly at higher doses.
Contraindications
Caution in hypothyroidism and in people taking levothyroxine, since lemon balm constituents inhibit thyroid-stimulating hormone binding in laboratory models.
Drug Interactions
- Sedatives and hypnotics — additive sedation
- Thyroid hormone — theoretical antithyroid interference
- GABAergic drugs — theoretical additive effect
Pregnancy & Breastfeeding
Pregnancy: insufficient_data
Breastfeeding: insufficient_data
Dosage Guidelines
Dosage Used in Studies
300-1200 mg
Best Time to Take
Evening for sleep; as needed for situational stress
Best Form
Extract standardised to rosmarinic acid
Bioavailability
Rosmarinic acid is absorbed rapidly with plasma peaks within one to two hours, matching the acute onset users report.
Forms Compared
Standardised extract
Dried herb tea
Combination with valerian
Food & Timing
With or without food.
Medical Disclaimer
The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.
Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.