A research review of human and relevant scientific studies on Melissa officinalis.
Last reviewed: August 2026
🔬 Research Summary
- Cognitive performance: Randomized human studies have investigated attention, memory and cognitive performance. Some acute studies report improvements after standardized preparations, while longer-term findings are mixed.
- Stress & mood: Clinical studies have reported effects on mood and laboratory-induced stress in some settings.
- Anxiety: Small human trials have investigated anxiety symptoms, including studies using combinations or standardized extracts.
- Sleep: Human studies have examined sleep quality and sleep-related outcomes, with promising but not uniform results.
- Rosmarinic acid & phytochemistry: Rosmarinic acid is a major phenolic constituent of lemon balm. Analytical research shows that water-based brewing can extract rosmarinic acid and other polyphenols.
- Digestive research: Traditional digestive use is supported by some preclinical and small clinical research, but evidence is less developed than for cognitive and psychological outcomes.
The sections below summarize the principal health areas investigated in the literature. Evidence strength is not uniform, and studies using extracts, oils, capsules or combination products are identified conceptually rather than treated as interchangeable with tea.
Cognitive performance
What researchers found
Randomized human studies have investigated attention, memory and cognitive performance. Some acute studies report improvements after standardized preparations, while longer-term findings are mixed.
What remains uncertain
Study results, doses, preparations and participant populations differ. Where the evidence is based mainly on extracts, oils, capsules, combinations, laboratory models or people with a specific condition, that limitation should be considered when interpreting the findings for a normal cup of tea.
Stress & mood
What researchers found
Clinical studies have reported effects on mood and laboratory-induced stress in some settings.
What remains uncertain
Study results, doses, preparations and participant populations differ. Where the evidence is based mainly on extracts, oils, capsules, combinations, laboratory models or people with a specific condition, that limitation should be considered when interpreting the findings for a normal cup of tea.
Anxiety
What researchers found
Small human trials have investigated anxiety symptoms, including studies using combinations or standardized extracts.
What remains uncertain
Study results, doses, preparations and participant populations differ. Where the evidence is based mainly on extracts, oils, capsules, combinations, laboratory models or people with a specific condition, that limitation should be considered when interpreting the findings for a normal cup of tea.
Sleep
What researchers found
Human studies have examined sleep quality and sleep-related outcomes, with promising but not uniform results.
What remains uncertain
Study results, doses, preparations and participant populations differ. Where the evidence is based mainly on extracts, oils, capsules, combinations, laboratory models or people with a specific condition, that limitation should be considered when interpreting the findings for a normal cup of tea.
Rosmarinic acid & phytochemistry
What researchers found
Rosmarinic acid is a major phenolic constituent of lemon balm. Analytical research shows that water-based brewing can extract rosmarinic acid and other polyphenols.
What remains uncertain
Study results, doses, preparations and participant populations differ. Where the evidence is based mainly on extracts, oils, capsules, combinations, laboratory models or people with a specific condition, that limitation should be considered when interpreting the findings for a normal cup of tea.
Digestive research
What researchers found
Traditional digestive use is supported by some preclinical and small clinical research, but evidence is less developed than for cognitive and psychological outcomes.
What remains uncertain
Study results, doses, preparations and participant populations differ. Where the evidence is based mainly on extracts, oils, capsules, combinations, laboratory models or people with a specific condition, that limitation should be considered when interpreting the findings for a normal cup of tea.
Overall Assessment
Lemon balm has a useful human literature spanning cognition, mood, stress and sleep, but many of the strongest cognitive studies use standardized extracts. The phytochemical evidence for water infusion is useful context but does not itself establish a health effect.
References
- Kennedy DO, Wake G, Savelev S, et al. Modulation of mood and cognitive performance following acute administration of Melissa officinalis. Neuropsychopharmacology. 2003.
- Kennedy DO, Little W, Scholey AB. Attenuation of laboratory-induced stress in humans after acute administration of Melissa officinalis. Psychosom Med. 2004;66:607-613. PMID: 15272110.
- Noguchi-Shinohara M, et al. Effects of Melissa officinalis Extract Containing Rosmarinic Acid on Cognition in Older Adults Without Dementia: A Randomized Controlled Trial. J Alzheimers Dis. 2023;91(2):805-814. PMID: 36502333. doi:10.3233/JAD-220953.
- Mathews I, et al. The acute effects of Zensera (Melissa officinalis L.) extract on mood and cognitive performance during cognitive overload: a randomized placebo-controlled double-blind study. Ther Adv Psychopharmacol. 2026. PMID: 41782777.
Reference note: References were selected to represent the principal human clinical and systematic-review evidence discussed in this article. Where direct tea-infusion evidence is limited, the article explicitly identifies that limitation.
Publication version: August 2026
If you would like to try it for yourself, our Pure Lemon Balm Tea is handpicked, shade dried and hand blended with nothing else added.
These statements have not been evaluated by Medsafe. This tea is not intended to diagnose, treat, cure, or prevent any disease. If you are pregnant, breastfeeding, or managing a health condition, check with your healthcare provider before making it a regular habit.
