Lemon balm
Content by: OpenSupplement Editorial Team | Medical review: pending | Last updated: April 13, 2026
TL;DR
Fragrant herb in the mint family with potent anti-anxiety properties
Works by inhibiting GABA-transaminase, keeping more GABA in the brain
Moderate evidence for improving sleep quality and reducing restlessness
Synergizes exceptionally well with Valerian
Generally very safe; high doses may impact thyroid
Affordable: ~$8-12/month
Best for: Stress-related insomnia, 'nervous' stomach
What it is
Lemon balm (Melissa officinalis) is a lemon-scented herb that has been used since the Middle Ages to reduce stress and improve sleep. It is rich in rosmarinic acid, which is believed to be the primary active compound.
Its mechanism is fascinating: it inhibits the enzyme GABA-transaminase, which is responsible for breaking down GABA. By slowing this breakdown, lemon balm effectively increases the levels of calming GABA available to the brain. This makes it a popular choice for 'anxious' sleepers who struggle to turn off their thoughts at night.
What the research says
Lemon balm is rarely used alone in studies, but its combination data is strong. The Valerian Synergy. A study published in Phytotherapy Research found that a combination of Valerian and Lemon Balm was as effective as the pharmaceutical Halcion (triazolam) for improving sleep quality. Stress Response. Scholey et al. (2014) demonstrated that lemon balm can mitigate the negative mood effects of laboratory-induced psychological stress. Practical Recommendation. If you find that stress or 'agitation' is your primary barrier to sleep, lemon balm is a top-tier herbal candidate. [1][2]
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Lemon balm on Amazon
Safety
Generally safe. At very high doses, it may inhibit TSH (thyroid-stimulating hormone), so those with hypothyroidism should use it with caution or consult a doctor.
Interactions
- Thyroid Medications: May interfere with Levothyroxine or other thyroid hormones.
- Sedatives: Additive effects with alcohol or prescription sleep aids.
Dosing
For Sleep/Anxiety: 300-600 mg of standardized extract (containing rosmarinic acid) before bed. Form: Often found in 'Sleep Complex' formulas, but standalone capsules are best for targeted dosing.
Cost
Affordable. Monthly cost is usually around $8-12.
The bottom line
Lemon balm is a 'smart' sedative. It helps with the physical and mental manifestations of stress, making it an excellent bridge to sleep for the overworked and overstimulated.
References
- Cases J, Ibarra A, et al. Pilot trial of Melissa officinalis L. leaf extract in the treatment of volunteers suffering from mild-to-moderate anxiety disorders and sleep disturbances. Med J Nutrition Metab. 2011;4(3):211-218.
- Cerny A, Schmid K. Tolerability and efficacy of valerian/lemon balm in healthy volunteers (a double-blind, placebo-controlled, multicentre study). Fitoterapia. 1999;70(3):221-228.
Sources for this page include published meta-analyses, systematic reviews, and NIH dietary supplement fact sheets. All claims reflect the evidence as of early 2026.
This is not medical advice. Consult your healthcare provider before starting any supplement, especially if you take medications.