TempoLife › Features › Herb and spice reference: evidence, dose and interactions › lemon-balm
Lemon balm
Lemon balm — what the European monograph actually supports, what it is not for, the form and how long it is meant to be used, side effects, and the 2 medicine interactions documented for it.
This is a reference page, not a diagnosis and not a prescription. Herbal products are real pharmacology: they have effects, side effects and interactions with medicines. Tell your doctor and your pharmacist everything you take, including teas and supplements, and never stop or change a prescribed medicine because of anything you read here.
What it is
Melissa officinalis L. — leaf (Melissae folium)
Local names across the region this site serves: sidrunmeliss (ET) · sitruunamelissa (FI) · мелисса (RU).
Grouped here under Sleep, stress and calm. Regulatory position: EU herbal monograph — traditional use.
What the evidence supports
The registered indication: Relief of mild symptoms of mental stress and to aid sleep; and, separately, mild digestive complaints including bloating and flatulence.
Lemon balm carries two traditional-use indications that sit oddly together — calming and carminative — which is a fair description of how it is actually used across northern Europe: a garden mint-family plant brewed after dinner. There is a third use with a different evidence base: small randomised trials of a lemon-balm cream applied at the first tingle of a cold sore have reported faster healing, and such creams are sold in several European countries. That is a topical antiviral claim about a specific cream, entirely separate from drinking the tea.
C — Traditional use only Plausible from thirty or more years of use, which is what a traditional-use registration means. No clinical evidence was required and none has settled it.
What it is not for
Anxiety disorders, insomnia with a cause, or treating an established cold sore outbreak with the tea rather than the cream.
Form, strength and how long
Fresh or dried leaf as an infusion, liquid extract, dry-extract tablets, and topical cream preparations. It is very commonly blended with valerian and hops, which is why single-herb evidence is scarce.
Duration. Short-term use; the monograph frames it as relief while symptoms last, not a standing habit.
No gram figure appears on this page on purpose. The plant part, the extraction solvent and the drug-to-extract ratio together define a preparation, and a number taken from one does not describe another. The reasoning is set out on the hub; the amount that applies to you is the one printed on the pack you are holding, and a pharmacist will read it with you.
Side effects
Well tolerated. Occasional drowsiness and stomach upset. Contact allergy from creams is uncommon.
Who should avoid it
Not established in pregnancy or breastfeeding. Traditional-use registrations generally exclude young children.
Interactions with medicines
| Medicine or substance | What is described |
|---|---|
| Sleeping tablets, benzodiazepines and sedating antihistamines | Additive drowsiness with sedatives and sleeping tablets, most noticeable with concentrated extracts rather than tea. |
| Levothyroxine and thyroid treatment | Laboratory work suggests lemon-balm extracts can interfere with thyroid hormone signalling. There is no clinical evidence of harm in people, but if you take levothyroxine or are treated for a thyroid condition, put it on the list you show the doctor rather than discovering it later. |
The reverse view — start from the medicine rather than the plant — is in the medicine, food and alcohol interactions reference, and summarised for every herb on this site.
Sources: European Medicines Agency — Committee on Herbal Medicinal Products (HMPC), European Union herbal monographs · NIH National Center for Complementary and Integrative Health — herb fact sheets · checked 2026-09-06
Frequently asked questions
What is lemon balm used for?
Relief of mild symptoms of mental stress and to aid sleep; and, separately, mild digestive complaints including bloating and flatulence. Lemon balm carries two traditional-use indications that sit oddly together — calming and carminative — which is a fair description of how it is actually used across northern Europe: a garden mint-family plant brewed after dinner. There is a third use with a different evidence base: small randomised trials of a lemon-balm cream applied at the first tingle of a cold sore have reported faster healing, and such creams are sold in several European countries. That is a topical antiviral claim about a specific cream, entirely separate from drinking the tea.
Does lemon balm work?
Graded C here: Plausible from thirty or more years of use, which is what a traditional-use registration means. No clinical evidence was required and none has settled it. Anxiety disorders, insomnia with a cause, or treating an established cold sore outbreak with the tea rather than the cream.
How much lemon balm should I take?
This reference does not print gram figures, because they do not transfer between preparations of different extract strength. What can be said honestly is the form and the duration: Fresh or dried leaf as an infusion, liquid extract, dry-extract tablets, and topical cream preparations. It is very commonly blended with valerian and hops, which is why single-herb evidence is scarce. Short-term use; the monograph frames it as relief while symptoms last, not a standing habit.
What are the side effects of lemon balm?
Well tolerated. Occasional drowsiness and stomach upset. Contact allergy from creams is uncommon.
Does lemon balm interact with medicines?
Yes — documented for Sedatives, Levothyroxine. Each one is described on this page, with a link to the medicine-side reference where one exists.
Others in sleep, stress and calm
Valerian
Relief of mild nervous tension and to aid sleep.
Chamomile
Mild digestive complaints including bloating and flatulence; as a mouth rinse for minor inflammation of the mouth and throat; on the skin for minor irritation; as a steam inhalation for a cold.
Lavender
Relief of mild symptoms of mental stress and exhaustion, and to aid sleep; the oil is also registered as a bath additive.
Passionflower
Relief of mild symptoms of mental stress and to aid sleep.
Keep the whole list in one place
TempoLife logs supplements alongside food, sleep and how you actually felt — so the answer to "what are you taking?" is a screen, not a guess.