# Melissa officinalis L. (Lemon Balm): An Integrative Review of Phytochemistry and Evidence from Preclinical Research to Clinical Studies

## TL;DR

Lemon balm has diverse bioactivities, but its effects depend heavily on preparation methods, with consistent evidence for anxiety and sleep benefits.

## Contribution

This review integrates lemon balm's phytochemistry with preclinical and clinical findings to guide future standardized research.

## Key findings

- Lemon balm consistently shows antioxidant and anti-inflammatory effects across preclinical models.
- Clinical trials support its use for anxiety, stress, and sleep-related outcomes.
- Evidence for other uses remains inconsistent due to preparation variability.

## Abstract

Melissa officinalis L. (lemon balm) is a Lamiaceae species widely used in traditional and contemporary herbal practice, yet its reported bioactivities are strongly preparation-dependent, reflecting variability between polyphenol-rich extracts and volatile essential-oil fractions. This integrative review links phytochemistry with recent preclinical findings and available clinical evidence. Across model systems, lemon balm most consistently shows antioxidant and anti-inflammatory signatures, with additional domain-specific signals reported in neurobehavioral, cardiometabolic, gastrointestinal, and dermatological models; however, comparability is limited by heterogeneous plant parts, extraction procedures, and chemical standardization. Preclinical findings were organized by biological domain, whereas clinically, the most consistent signals are observed for symptom-oriented endpoints, particularly anxiety/stress and sleep-related outcomes reported in controlled trials, including aromatherapy studies, while evidence for other indications remains mixed or insufficiently confirmed. Overall, the evidence supports continued development of chemically characterized, standardized preparations and mechanism-informed trials with harmonized outcomes and robust safety reporting to improve translational interpretability.