Lemon balm: Difference between revisions

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| plant_part = Aerial parts (leaves and flowering tops), harvested just before full flowering when volatile oil content peaks; occasionally the essential oil distilled from fresh herb.

| image =

| intro = Melissa officinalis L. -- lemon balm, balm, melissa -- is a perennial herb of the mint family whose Greek name means bee, a record of the insects that congregate on its small white flowers and make from them a honey prized in antiquity. It has been called "the elixir of life" by Paracelsus and "sovereign for the brain" by John Evelyn; its unbroken reputation across two thousand years of Western and Islamic medicine is for lifting the heart, clearing the head, and settling the gut. The same compounds responsible for its sharp lemon scent -- the polyphenolic fraction concentrated in its leaves -- have turned out to be active against herpes simplex virus in controlled trials, giving it a specific antiviral credential unlike any other common nervine herb.

| intro = ''Melissa officinalis'' L. -- lemon balm, balm, melissa -- is a perennial herb of the mint family whose Greek name means bee, a record of the insects that congregate on its small white flowers and make from them a honey prized in antiquity. It has been called "the elixir of life" by Paracelsus and "sovereign for the brain" by John Evelyn; its unbroken reputation across two thousand years of Western and Islamic medicine is for lifting the heart, clearing the head, and settling the gut. The same compounds responsible for its sharp lemon scent -- the polyphenolic fraction concentrated in its leaves -- have turned out to be active against herpes simplex virus in controlled trials, giving it a specific antiviral credential unlike any other common nervine herb.

| history = The genus name carries the oldest story. In Greek myth, Melissa was a bee-priestess of the mountain goddess Cybele; she fed the infant Zeus on honey when his father Kronos sought to devour him, and was afterward transformed into a bee. Theophrastus in the fourth century BCE noted that beekeepers rubbed hive entrances with melissa leaves to keep their colonies from straying -- a practice that survives in modern beekeeping -- and the plant's association with bees, honey, and the sweetness of life runs through every tradition that has known it.{{citation needed}}

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The most enduring and delightful preparation in lemon balm's history was not a medicine in the modern sense but a spirit: Carmelite water (eau des Carmes), developed by the Carmelite nuns in Paris in the fourteenth century from lemon balm, lemon peel, nutmeg, coriander, angelica root, and cloves in high-proof spirits. It circulated as a tonic for the heart, a remedy against fainting and melancholy, and a general cordial; Charles V of France was reputed to drink it daily.{{citation needed}} The preparation survives commercially today under the Boyer label in France, continuous from the 17th century, and may be the longest-lived packaged medicinal preparation in Western Europe.

John Evelyn, the English diarist and gardener, wrote in the late seventeenth century: "Balm is sovereign for the brain, strengthening the memory and powerfully chasing away melancholy."{{citation needed}} The modern dimension was added not by herbalists but by laboratory pharmacologists. In 1994, the German physician and researcher Rainer Wölbling published the first rigorously controlled clinical trial of a standardized lemon balm cream -- subsequently commercialized as Lomaherpan -- applied to cold sores caused by herpes simplex virus.<ref name="wolbling1994">Wolbling RH, Leonhardt K. "Local therapy of herpes simplex with dried extract from Melissa officinalis." Phytomedicine. 1994;1(1):25-31. PMID 23195812.</ref> The trial demonstrated that what herbalists had used empirically for mouth sores for centuries worked through a specific mechanism -- rosmarinic acid and other polyphenols blocking herpes virus attachment to host cells -- that remains among the most mechanistically coherent antiviral findings in phytomedicine.

John Evelyn, the English diarist and gardener, wrote in the late seventeenth century: "Balm is sovereign for the brain, strengthening the memory and powerfully chasing away melancholy."{{citation needed}} The modern dimension was added not by herbalists but by laboratory pharmacologists. In 1994, the German physician and researcher Rainer Wölbling published the first rigorously controlled clinical trial of a standardized lemon balm cream -- subsequently commercialized as Lomaherpan -- applied to cold sores caused by herpes simplex virus.<ref name="wolbling1994">Wolbling RH, Leonhardt K. "Local therapy of herpes simplex with dried extract from ''Melissa officinalis''." Phytomedicine. 1994;1(1):25-31. PMID 23195812.</ref> The trial demonstrated that what herbalists had used empirically for mouth sores for centuries worked through a specific mechanism -- rosmarinic acid and other polyphenols blocking herpes virus attachment to host cells -- that remains among the most mechanistically coherent antiviral findings in phytomedicine.

| taxonomy = Melissa officinalis L. is placed in tribe Mentheae, family Lamiaceae, the sole widely used species in the genus Melissa. The genus name derives from the Greek melissa (bee); the species epithet officinalis (of the dispensary) is shared with hundreds of medicinal plants and indicates long-standing apothecary use. No infraspecific taxa carry commercial or medicinal significance.

| taxonomy = ''Melissa officinalis'' L. is placed in tribe Mentheae, family Lamiaceae, the sole widely used species in the genus Melissa. The genus name derives from the Greek melissa (bee); the species epithet officinalis (of the dispensary) is shared with hundreds of medicinal plants and indicates long-standing apothecary use. No infraspecific taxa carry commercial or medicinal significance.

L. officinalis is a vigorous, branching perennial growing to 1.5 m (5 ft), with deeply veined, toothed bright-green leaves that release a sharp lemon scent when crushed -- a quality immediately distinguishing it from mint (Mentha) and other Lamiaceae in the garden. The lemon scent derives principally from citronellal, a compound also responsible for the scent of lemongrass (Cymbopogon citratus) and lemon eucalyptus (Corymbia citriodora), reflecting convergent volatile chemistry across plant families rather than close botanical relationship.

''L. officinalis'' is a vigorous, branching perennial growing to 1.5 m (5 ft), with deeply veined, toothed bright-green leaves that release a sharp lemon scent when crushed -- a quality immediately distinguishing it from mint (''Mentha'') and other Lamiaceae in the garden. The lemon scent derives principally from citronellal, a compound also responsible for the scent of lemongrass (''Cymbopogon citratus'') and lemon eucalyptus (''Corymbia citriodora''), reflecting convergent volatile chemistry across plant families rather than close botanical relationship.

The small white flowers, tinged pink or lilac, appear in dense axillary clusters from early summer onward; they are rich in nectar and unusually attractive to honeybees. In the garden lemon balm self-seeds freely and becomes naturalized with ease; it is one of the least demanding of the Lamiaceae in cultivation, tolerating partial shade, poor soils, and neglect.

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'''Islamic medicine (Unani)'''

Lemon balm appears in Islamic-Galenic medicine as Turunjan (ترنجان) and, in some North African traditions, as Badharuj -- though this Arabic identifier is also applied by some sources to sweet basil (Ocimum basilicum), creating a minor source-identification ambiguity.{{citation needed}} Ibn Sina's Canon of Medicine praises it in terms that no other classical herbalist surpassed: lemon balm "causeth the heart and mind to become merry, exhilarateth the mind, settleth digestion, and is good against melancholy and the spleen." The Canon identifies it as a warming, drying herb good for cold temperaments, for cardiac palpitations, and for the "sadness and grief" that Ibn Sina associated with obstruction of the vital spirit.{{citation needed}}

Lemon balm appears in Islamic-Galenic medicine as Turunjan (ترنجان) and, in some North African traditions, as Badharuj -- though this Arabic identifier is also applied by some sources to sweet basil (''Ocimum basilicum''), creating a minor source-identification ambiguity.{{citation needed}} Ibn Sina's Canon of Medicine praises it in terms that no other classical herbalist surpassed: lemon balm "causeth the heart and mind to become merry, exhilarateth the mind, settleth digestion, and is good against melancholy and the spleen." The Canon identifies it as a warming, drying herb good for cold temperaments, for cardiac palpitations, and for the "sadness and grief" that Ibn Sina associated with obstruction of the vital spirit.{{citation needed}}

'''Ayurvedic medicine'''

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| pharmacology = '''Volatile oil and polyphenolic constituents'''

The essential oil of M. officinalis is dominated by citral -- a mixture of the geometric isomers geranial and neral -- which accounts for the plant's characteristic lemon scent, along with citronellal, linalool, and caryophyllene oxide.{{citation needed}} The volatile oil fraction, however, is present in much lower concentration than in most other medicinal Lamiaceae (under 0.2 percent of fresh weight), and its contribution to the therapeutic actions of whole-plant preparations may be secondary to the non-volatile polyphenolic fraction.

The essential oil of ''M. officinalis'' is dominated by citral -- a mixture of the geometric isomers geranial and neral -- which accounts for the plant's characteristic lemon scent, along with citronellal, linalool, and caryophyllene oxide.{{citation needed}} The volatile oil fraction, however, is present in much lower concentration than in most other medicinal Lamiaceae (under 0.2 percent of fresh weight), and its contribution to the therapeutic actions of whole-plant preparations may be secondary to the non-volatile polyphenolic fraction.

Rosmarinic acid and related caffeic acid derivatives -- the principal polyphenolic compounds in lemon balm -- are the dominant pharmacologically active fraction for antiviral activity. Rosmarinic acid and the tannin fraction interfere with viral attachment to host cells by binding to glycoproteins on the herpes simplex virus (HSV) envelope, preventing the virus from docking with cell-surface receptors; this mechanism has been demonstrated in cell-culture models and correlates with the clinical efficacy of topical Melissa preparations in herpes labialis.{{citation needed}}

Rosmarinic acid and related caffeic acid derivatives -- the principal polyphenolic compounds in lemon balm -- are the dominant pharmacologically active fraction for antiviral activity. Rosmarinic acid and the tannin fraction interfere with viral attachment to host cells by binding to glycoproteins on the herpes simplex virus (HSV) envelope, preventing the virus from docking with cell-surface receptors; this mechanism has been demonstrated in cell-culture models and correlates with the clinical efficacy of topical Melissa preparations in herpes labialis.{{citation needed}}

The flavonoids (luteolin, apigenin) and triterpenes (ursolic and oleanolic acids) contribute anti-inflammatory and anxiolytic properties; apigenin in particular has affinity for the benzodiazepine receptor site of the GABA-A receptor, and this GABA-A interaction is the proposed basis for lemon balm's anxiolytic and mild sedative activity -- the same general mechanism as valerian, passionflower, and lavender, reflecting convergent pharmacology across unrelated plant families.{{citation needed}}

The anti-thyroid mechanism is distinct from both of the above: aqueous extracts of Melissa officinalis inhibit binding of thyroid-stimulating hormone (TSH) and Graves' immunoglobulins to TSH receptors in vitro, reducing thyroid stimulation. The mechanism is thought to involve the polyphenolic fraction competitively occupying the TSH receptor or blocking immunoglobulin binding sites.

The anti-thyroid mechanism is distinct from both of the above: aqueous extracts of ''Melissa officinalis'' inhibit binding of thyroid-stimulating hormone (TSH) and Graves' immunoglobulins to TSH receptors in vitro, reducing thyroid stimulation. The mechanism is thought to involve the polyphenolic fraction competitively occupying the TSH receptor or blocking immunoglobulin binding sites.

| clinical_evidence = '''Antiviral: herpes simplex (topical)'''

The strongest and most specific clinical evidence for lemon balm is topical and antiviral. The German physician Rainer Wölbling conducted the first placebo-controlled trial of a standardized Melissa cream on recurrent cold sores in 1994, demonstrating significant reduction in lesion size, healing time, and symptom severity with a 1 percent dried Melissa extract cream applied four times daily.<ref name="wolbling1994">Wolbling RH, Leonhardt K. "Local therapy of herpes simplex with dried extract from Melissa officinalis." Phytomedicine. 1994;1(1):25-31. PMID 23195812.</ref>

The strongest and most specific clinical evidence for lemon balm is topical and antiviral. The German physician Rainer Wölbling conducted the first placebo-controlled trial of a standardized Melissa cream on recurrent cold sores in 1994, demonstrating significant reduction in lesion size, healing time, and symptom severity with a 1 percent dried Melissa extract cream applied four times daily.<ref name="wolbling1994">Wolbling RH, Leonhardt K. "Local therapy of herpes simplex with dried extract from ''Melissa officinalis''." Phytomedicine. 1994;1(1):25-31. PMID 23195812.</ref>

Koytchev and colleagues (1999) confirmed and extended these findings in a larger placebo-controlled trial of the Lomaherpan-equivalent preparation (Lo-701, a 70:1 Melissa dry extract cream) applied four times daily to active cold sore lesions. The treated group showed significantly faster healing, smaller lesion area at day two, and reduced pain compared with placebo; the authors noted particularly strong benefit in patients treated at first symptom appearance (the prodrome or early vesicle stage) before full lesion development.<ref name="koytchev1999">Koytchev R, Alken RG, Dundarov S. "Balm mint extract (Lo-701) for topical treatment of recurring herpes labialis." Phytomedicine. 1999;6(4):225-230. PMID 10589440.</ref>

The commercial preparation Lomaherpan (standardized 1 percent Melissa officinalis extract cream; Lomapharm, Germany) continues to be used and studied on this basis; it is the reference preparation for the EMA's traditional use opinion on Melissa for cold sores.

The commercial preparation Lomaherpan (standardized 1 percent ''Melissa officinalis'' extract cream; Lomapharm, Germany) continues to be used and studied on this basis; it is the reference preparation for the EMA's traditional use opinion on Melissa for cold sores.

The evidence is specific to topical application: lemon balm polyphenols must be in direct contact with the HSV-infected tissue to exert their envelope-binding antiviral effect. Internal lemon balm preparations (infusion, tincture) have not been evaluated in placebo-controlled trials for recurrent herpes; the antiviral claim should not be extended to oral preparations without direct supporting evidence.

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'''Mood and cognitive modulation (oral preparations)'''

Kennedy and colleagues conducted a series of dose-finding studies in healthy volunteers that provide the clearest pharmacological picture of oral lemon balm's cognitive and mood effects. In a 2002 crossover study, single doses of a standardized Melissa officinalis extract (300 mg, 600 mg, or 900 mg) produced dose-dependent improvements in calmness ratings and speed of mathematical processing on validated psychometric batteries; notably, the highest dose (900 mg) reduced calmness ratings relative to placebo, suggesting an inverted-U dose-effect relationship -- a feature consistent with the GABA-A modulation mechanism and commonly observed with GABAergic agents.<ref name="kennedy2002">Kennedy DO, Scholey AB, Tildesley NT, Perry EK, Wesnes KA. "Modulation of mood and cognitive performance following acute administration of Melissa officinalis (lemon balm)." Pharmacology Biochemistry and Behavior. 2002;72(4):953-964. PMID 12062586.</ref>

Kennedy and colleagues conducted a series of dose-finding studies in healthy volunteers that provide the clearest pharmacological picture of oral lemon balm's cognitive and mood effects. In a 2002 crossover study, single doses of a standardized ''Melissa officinalis'' extract (300 mg, 600 mg, or 900 mg) produced dose-dependent improvements in calmness ratings and speed of mathematical processing on validated psychometric batteries; notably, the highest dose (900 mg) reduced calmness ratings relative to placebo, suggesting an inverted-U dose-effect relationship -- a feature consistent with the GABA-A modulation mechanism and commonly observed with GABAergic agents.<ref name="kennedy2002">Kennedy DO, Scholey AB, Tildesley NT, Perry EK, Wesnes KA. "Modulation of mood and cognitive performance following acute administration of ''Melissa officinalis'' (lemon balm)." Pharmacology Biochemistry and Behavior. 2002;72(4):953-964. PMID 12062586.</ref>

A 2003 companion study found significant improvements in mood and cognitive performance following single oral doses, with dose-dependent effects on the speed of memory and spatial working memory tasks.<ref name="kennedy2003">Kennedy DO, Wake G, Savelev S, et al. "Modulation of mood and cognitive performance following acute administration of single doses of Melissa officinalis (lemon balm) with human pharmacological models." Neuropsychopharmacology. 2003;28(10):1871-1881. PMID 12888775.</ref>

A 2003 companion study found significant improvements in mood and cognitive performance following single oral doses, with dose-dependent effects on the speed of memory and spatial working memory tasks.<ref name="kennedy2003">Kennedy DO, Wake G, Savelev S, et al. "Modulation of mood and cognitive performance following acute administration of single doses of ''Melissa officinalis'' (lemon balm) with human pharmacological models." Neuropsychopharmacology. 2003;28(10):1871-1881. PMID 12888775.</ref>

In a 2006 study, Kennedy and colleagues evaluated a standardized combination of Melissa officinalis and Valeriana officinalis (valerian) extract under laboratory-induced stress conditions. The combination produced significant reductions in anxiety ratings during a multi-tasking battery, reductions in self-rated stress and alertness, and mood improvements relative to placebo; the effects were consistent with additive or synergistic action of the two plant extracts' respective mechanisms.<ref name="kennedy2006">Kennedy DO, Little W, Haskell CF, Scholey AB. "Anxiolytic effects of a combination of Melissa officinalis and Valeriana officinalis during laboratory induced stress." Phytotherapy Research. 2006;20(2):96-102. PMID 16444660.</ref>

In a 2006 study, Kennedy and colleagues evaluated a standardized combination of ''Melissa officinalis'' and ''Valeriana officinalis'' (valerian) extract under laboratory-induced stress conditions. The combination produced significant reductions in anxiety ratings during a multi-tasking battery, reductions in self-rated stress and alertness, and mood improvements relative to placebo; the effects were consistent with additive or synergistic action of the two plant extracts' respective mechanisms.<ref name="kennedy2006">Kennedy DO, Little W, Haskell CF, Scholey AB. "Anxiolytic effects of a combination of ''Melissa officinalis'' and ''Valeriana officinalis'' during laboratory induced stress." Phytotherapy Research. 2006;20(2):96-102. PMID 16444660.</ref>

These studies establish a real but modest anxiolytic and cognitive-modulating effect of oral lemon balm that is consistent with the GABA-A mechanism. Effect sizes are smaller than those seen with oral Silexan for generalized anxiety disorder; the evidence base is sufficient for mild-to-moderate situational anxiety but has not been evaluated against prescription anxiolytics in the manner of the Silexan trials.

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'''Anti-thyroid activity (in vitro and limited clinical data)'''

Auf'mkolk and colleagues (1985) demonstrated in an in vitro receptor-binding assay that aqueous extracts of Melissa officinalis (and several other plants) inhibit the binding of thyroid-stimulating hormone and Graves' immunoglobulins to TSH receptors, reducing adenylate cyclase stimulation.<ref name="aufmkolk1985">Auf'mkolk M, Ingbar JC, Kubota K, Amir SM, Ingbar SH. "Extracts and auto-oxidized constituents of certain plants inhibit the receptor-binding and the biological activity of Graves' immunoglobulins." Endocrinology. 1985;116(5):1687-1693. PMID 2985357.</ref> This finding has been used as the pharmacological rationale for combining lemon balm with bugleweed (Lycopus europaeus) as an adjunctive herbal support in mild hyperthyroidism and Graves' disease; controlled clinical trials evaluating this combination for clinical outcomes in hyperthyroid patients are limited in number and quality.{{citation needed}}

Auf'mkolk and colleagues (1985) demonstrated in an in vitro receptor-binding assay that aqueous extracts of ''Melissa officinalis'' (and several other plants) inhibit the binding of thyroid-stimulating hormone and Graves' immunoglobulins to TSH receptors, reducing adenylate cyclase stimulation.<ref name="aufmkolk1985">Auf'mkolk M, Ingbar JC, Kubota K, Amir SM, Ingbar SH. "Extracts and auto-oxidized constituents of certain plants inhibit the receptor-binding and the biological activity of Graves' immunoglobulins." Endocrinology. 1985;116(5):1687-1693. PMID 2985357.</ref> This finding has been used as the pharmacological rationale for combining lemon balm with bugleweed (''Lycopus europaeus'') as an adjunctive herbal support in mild hyperthyroidism and Graves' disease; controlled clinical trials evaluating this combination for clinical outcomes in hyperthyroid patients are limited in number and quality.{{citation needed}}

'''Pediatric use'''

The use of lemon balm for sleep disturbance and nervousness in children is supported by tradition, basic safety data, and a limited clinical literature that includes combination preparations (valerian plus lemon balm).{{citation needed}} No serious adverse effects attributable to lemon balm have been reported in pediatric use at traditional doses.

The use of lemon balm for sleep disturbance and nervousness in children is supported by tradition, basic safety data, and a limited clinical literature that includes combination preparations (valerian plus lemon balm).{{citation needed}} No serious adverse effects attributable to lemon balm have been reported in pediatric use at traditional doses.

| preparations = Infusion (tea): 2 to 4 g dried leaf and flowering tops per cup of hot water, covered while steeping (10 to 15 minutes) to retain the volatile oil fraction; the covering step is not cosmetic -- the volatile constituents are pharmacologically active and evaporate readily. Taken three times daily for daytime use or before sleep for insomnia.

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Topical cream: 1 percent standardized Melissa dry extract (Lomaherpan; equivalent commercial preparations) applied topically to cold sore lesions at first symptom; the antiviral evidence is specific to topical preparations with defined rosmarinic acid content.

Essential oil: rarely used therapeutically; primarily aromatherapy; expensive and frequently adulterated with lemongrass (Cymbopogon citratus) or lemon-scented verbena (Aloysia citrodora) oil; if used, always diluted in carrier oil.

Essential oil: rarely used therapeutically; primarily aromatherapy; expensive and frequently adulterated with lemongrass (''Cymbopogon citratus'') or lemon-scented verbena (''Aloysia citrodora'') oil; if used, always diluted in carrier oil.

Combination preparations: Melissa plus Valeriana officinalis (valerian) is the most common commercial combination, targeting sleep and mild anxiety; this combination has the best clinical evidence base (Kennedy 2006) for lemon balm's anxiolytic and sleep-promoting effects.

Combination preparations: Melissa plus ''Valeriana officinalis'' (valerian) is the most common commercial combination, targeting sleep and mild anxiety; this combination has the best clinical evidence base (Kennedy 2006) for lemon balm's anxiolytic and sleep-promoting effects.

| dosing = '''Internal preparations'''

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German Commission E: lemon balm (Melissenblätter) approved for nervous sleep disorders and functional gastrointestinal complaints; covers dried herb preparations (infusion, tincture) based on traditional use and the clinical evidence base.

EMA HMPC: positive opinion for traditional use of Melissa officinalis leaf for relief of mild symptoms of stress and to aid sleep; also for traditional use of standardized topical preparations for symptomatic treatment of cold sores (Herpes labialis). One HMPC monograph (EMA/HMPC/196745/2012) covers both the internal nervine/sleep indication and the topical herpes simplex indication.<ref name="ema-hmpc-melissa">European Medicines Agency, Committee on Herbal Medicinal Products (HMPC). Community herbal monograph on Melissa officinalis L., folium. EMA/HMPC/196745/2012. First published: 5 August 2013. https://www.ema.europa.eu/en/medicines/herbal/melissae-folium.</ref>

EMA HMPC: positive opinion for traditional use of ''Melissa officinalis'' leaf for relief of mild symptoms of stress and to aid sleep; also for traditional use of standardized topical preparations for symptomatic treatment of cold sores (Herpes labialis). One HMPC monograph (EMA/HMPC/196745/2012) covers both the internal nervine/sleep indication and the topical herpes simplex indication.<ref name="ema-hmpc-melissa">European Medicines Agency, Committee on Herbal Medicinal Products (HMPC). Community herbal monograph on ''Melissa officinalis'' L., folium. EMA/HMPC/196745/2012. First published: 5 August 2013. https://www.ema.europa.eu/en/medicines/herbal/melissae-folium.</ref>

'''United States'''

Melissa officinalis: GRAS (generally recognized as safe) as a food flavoring; sold as a dietary supplement under DSHEA without FDA evaluation of efficacy claims. No approved drug indication.

''Melissa officinalis'': GRAS (generally recognized as safe) as a food flavoring; sold as a dietary supplement under DSHEA without FDA evaluation of efficacy claims. No approved drug indication.

'''United Kingdom'''

MHRA traditional herbal registration: Melissa officinalis preparations registered for traditional use for mild anxiety and sleep disturbance, and for topical application to cold sores; the topical Lomaherpan-equivalent preparations are registered separately.

MHRA traditional herbal registration: ''Melissa officinalis'' preparations registered for traditional use for mild anxiety and sleep disturbance, and for topical application to cold sores; the topical Lomaherpan-equivalent preparations are registered separately.

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