Supplement analysis backed by scientific evidence · PT

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Limited evidenceSleep & relaxation

Lemon Balm

Small trials suggest lemon balm acutely increases self-rated calmness and may reduce anxiety and depression scores, but the pooled evidence rests on a few tiny, highly heterogeneous studies. Pleasant and very low-risk; not a proven treatment.

What the science says

  • Anxiety and depressive symptoms Limited evidence

    A systematic review and meta-analysis of randomized clinical trials found lemon balm significantly improved anxiety (SMD -0.98, 95% CI -1.63 to -0.33, p = 0.003) and depression scores (SMD -0.47, 95% CI -0.73 to -0.21, p = 0.0005) versus placebo, with no serious side effects. Heterogeneity was high, the trials were few and methodologically inconsistent, and the authors explicitly warn against over-interpreting the pooled numbers.

  • Acute stress and calmness Limited evidence

    In a double-blind crossover study, 18 healthy volunteers took 300 mg, 600 mg or placebo before a 20-minute laboratory stressor. The 600 mg dose reduced the negative mood effect of the stressor with significantly increased self-rated calmness and reduced self-rated alertness, while 300 mg sped mathematical processing without loss of accuracy. Eighteen participants and a single session is hypothesis-generating at best.

  • Sleep quality Limited evidence

    Lemon balm is most often tested for sleep inside combination products, typically with valerian, so any observed benefit cannot be attributed to lemon balm itself. Standalone trials with objective sleep measures are essentially absent.

Dosage & safety

Studied doseAcute studies used 300-600 mg of standardized extract as a single dose. Chronic trials used roughly 300-1000 mg/day for 2-8 weeks, often 500 mg twice daily. Tea is prepared from about 1.5-4.5 g of dried leaf per cup, though extract content in tea is not comparable to the trial doses.
SafetyOne of the safest herbs in common use. The main effect is drowsiness, which is additive with alcohol, benzodiazepines, antihistamines and other sedatives, so avoid it before driving; the 600 mg dose measurably reduced self-rated alertness in the stress trial. In vitro and animal work shows inhibition of TSH binding to its receptor, so caution is often advised with thyroid disease or levothyroxine, though no human cases are documented. Rare hypersensitivity reactions occur. Insufficient data in pregnancy and breastfeeding.

Scientific references

Where to buy

California Gold Nutrition, EuroHerbs™, Lemon Balm Extract, Euromed Quality, 500 mg, 60 Veggie Capsules

View on iHerb

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