Lemon balm tea is a caffeine-free herbal tea made from the leaves of Melissa officinalis, a plant in the mint family with a mild citrusy scent. It has been used for centuries as a calming drink, and modern research supports several of its traditional uses, particularly for easing anxiety, improving sleep, and settling digestive discomfort. A single cup contains roughly 1 gram of polyphenol compounds, plant-based antioxidants that drive most of its health effects.
What’s Actually in a Cup
Dried lemon balm leaves are surprisingly rich in polyphenols, containing about 11.8% by weight. When you steep the leaves in hot water, you extract roughly 93% of those compounds into your cup. The dominant one is rosmarinic acid, which makes up about 4.1% of the dried leaf and is responsible for much of the tea’s calming and antioxidant activity.
The leaves also contain a small amount of essential oil, about 0.32% of the dried herb. Hot water pulls out around a third of that oil, with citral (the same compound that gives lemons their smell) making up nearly three-quarters of what ends up in your cup. That’s where the signature lemony aroma comes from.
How It Reduces Anxiety and Stress
Lemon balm works on the brain through at least two pathways. First, its compounds inhibit an enzyme that breaks down GABA, the brain’s primary calming chemical. By slowing that breakdown, more GABA stays available, which promotes a sense of relaxation. Second, lemon balm has mild effects on the acetylcholine system, which plays a role in both mood and cognitive function.
A 2023 clinical trial tested a lemon balm extract in 100 adults experiencing emotional distress. After three weeks, the supplement group saw their anxiety scores drop from 22.2 to 6.7 on a standardized scale, while the placebo group only dropped from 21.1 to 15.9. Stress scores followed a similar pattern, falling from 26.3 to 8.2 in the lemon balm group compared to 26.1 to 20.0 with placebo. That trial used a concentrated extract rather than brewed tea, so the effects from drinking a cup will likely be milder, but the underlying compounds are the same.
Effects on Sleep
Lemon balm is one of the most common herbs paired with valerian in over-the-counter sleep aids, and there’s decent evidence for the combination. In a double-blind, placebo-controlled trial, volunteers taking valerian and lemon balm together reported 33% better sleep quality compared to just 9% improvement in the placebo group. That difference was statistically significant.
Drinking a cup of lemon balm tea before bed is a gentler approach than taking a supplement, but the same calming mechanisms are at work. The GABA-boosting effect helps quiet mental activity, and the lack of caffeine means it won’t interfere with your sleep cycle the way black or green tea might.
Digestive Comfort
Lemon balm has antispasmodic properties, meaning it can help relax the smooth muscle in your digestive tract. This makes it useful for occasional bloating, gas, and general stomach discomfort. Many commercial herbal digestive remedies include lemon balm alongside ginger and peppermint for this reason. If you’re reaching for a warm drink after a heavy meal, lemon balm tea is a reasonable choice for settling things down.
Memory and Focus
The cognitive effects of lemon balm are real but nuanced. A placebo-controlled study in 20 healthy young adults tested single doses at 300, 600, and 900 mg. The 600 mg dose produced a sustained improvement in accuracy of attention. However, the same study found dose- and time-specific reductions in both secondary memory (the ability to store and retrieve new information) and working memory. In practical terms, lemon balm may help you stay focused and calm during a task, but it’s not a memory enhancer in the traditional sense. The relaxation it produces seems to come with a trade-off in mental sharpness at higher doses.
Antiviral Properties
Lab studies have found that lemon balm essential oil is remarkably effective against herpes simplex viruses. At non-toxic concentrations, the oil reduced viral plaque formation by 98.8% for HSV-1 (oral herpes) and 97.2% for HSV-2 (genital herpes). The oil works by blocking the virus before it can enter cells, rather than after infection has already taken hold. Because the essential oil is fat-soluble and can penetrate skin, topical application of lemon balm preparations has shown promise for managing cold sores. Drinking the tea delivers different compounds than a topical oil, so these antiviral findings apply more to creams and balms than to your cup.
How to Brew It
Use 1.5 to 4.5 grams of dried lemon balm leaves per cup, which works out to roughly 1 to 3 teaspoons. Heat your water to just below boiling, around 190 to 200°F, and steep for 7 to 10 minutes. That longer steep time matters: it takes time to extract the polyphenols that give the tea its calming effects. If you’re blending lemon balm with green tea, use a lower temperature (175 to 185°F) and pull the green tea bag out at 3 minutes to avoid bitterness, leaving the lemon balm to steep longer.
Fresh leaves work too. Use about twice the volume you’d use for dried leaves, since fresh leaves contain more water. The flavor will be lighter and more floral.
Safety and Interactions
Lemon balm tea is well tolerated by most people and has a long history of safe use. There are no widely reported side effects at normal tea-drinking amounts. The main caution involves thyroid function: lemon balm may interfere with thyroid hormone activity, so people taking thyroid medication should be aware of this potential interaction. The evidence is preliminary, but it’s worth a conversation with your prescriber if you take levothyroxine or similar drugs.
Because of its calming effects, lemon balm could theoretically enhance the sedative effects of other medications or supplements that promote drowsiness. If you’re taking sleep aids or anti-anxiety medication, start with a single cup and pay attention to how you feel.