Lemon balm is generally considered safe for most healthy adults when consumed in moderate amounts as tea or food, but it can cause side effects in some people and may not be appropriate for everyone. Drowsiness, digestive discomfort, medication interactions, and thyroid-related concerns are among the most commonly discussed issues.
Lemon balm (Melissa officinalis) has been used for centuries as a calming herb and is often consumed as tea, tinctures, capsules, or herbal blends. While many people tolerate it well, understanding potential risks is just as important as understanding its benefits.
If you would like a complete overview of lemon balm, including its bioactive compounds, traditional uses, and health benefits, read our pillar guide: Lemon Balm (Melissa officinalis): Health Benefits, Uses, and Bioactive Compounds.
Is Lemon Balm Safe?
For most healthy adults, lemon balm is generally considered safe when used appropriately.
It has a long history of traditional use and is recognized in several herbal monographs for its use in mild stress, nervous tension, and sleep-related complaints.
However, “safe” does not mean risk-free.
Factors that may affect safety include:
- dosage,
- frequency of use,
- underlying medical conditions,
- medications,
- age,
- and individual sensitivity.
Most side effects tend to be mild and uncommon, especially when lemon balm is consumed as tea rather than concentrated supplements.
Common Lemon Balm Side Effects
Although many people experience no problems, some individuals may develop side effects.
Reported side effects may include:
- drowsiness,
- fatigue,
- headache,
- dizziness,
- nausea,
- digestive discomfort,
- bloating,
- stomach upset,
- dry mouth.
In most cases these effects are mild and temporary.
Side effects are more likely to occur when:
- large amounts are consumed,
- concentrated extracts are used,
- or lemon balm is combined with other calming substances.
Can Lemon Balm Cause Drowsiness?
Yes.
This is actually one of the reasons many people use lemon balm.
Its calming properties may help some individuals relax, particularly when consumed in the evening.
However, excessive drowsiness may occur in sensitive individuals, especially when lemon balm is combined with:
- sleep aids,
- sedative medications,
- alcohol,
- or other calming herbs.
For this reason, it is often best to try lemon balm for the first time when you do not need to drive or perform activities requiring full alertness.
Can Lemon Balm Affect the Thyroid?
This is one of the most frequently discussed safety questions regarding lemon balm.
Some laboratory research suggests compounds in lemon balm may influence thyroid-related pathways.
Because of this, individuals with thyroid conditions should exercise caution and consult their healthcare provider before using lemon balm regularly.
This does not mean lemon balm is harmful for everyone with thyroid issues, but it is an area where professional guidance is advisable.
Lemon Balm Drug Interactions
Like many herbs, lemon balm may interact with certain medications.
Potential interactions may involve:
- sedatives,
- sleep medications,
- anti-anxiety drugs,
- thyroid medications,
- medications affecting the central nervous system.
Because research is still evolving, people taking prescription medications should speak with a healthcare professional before using lemon balm regularly.
This is especially important when using concentrated extracts rather than occasional cups of tea.
Who Should Avoid Lemon Balm?
Certain groups should be more cautious with lemon balm.
These may include:
- people with thyroid disorders,
- individuals taking sedative medications,
- people preparing for surgery,
- those with known allergies to lemon balm or related plants,
- individuals advised by their healthcare provider to avoid herbal products.
Most healthy adults can consume lemon balm tea without difficulty, but caution is warranted when medical conditions are involved.
Is Lemon Balm Safe During Pregnancy?
Pregnancy is one of the situations where extra caution is appropriate.
While lemon balm has traditionally been used in herbal teas, scientific evidence regarding regular use during pregnancy remains limited.
Because recommendations can vary depending on the individual situation, pregnant women should consult their healthcare provider before using lemon balm regularly.
The same precaution applies to breastfeeding.
Can You Drink Lemon Balm Tea Every Day?
Many people drink lemon balm tea daily without experiencing problems.
Moderate daily consumption is generally considered acceptable for healthy adults.
However, daily use should still be approached thoughtfully.
Questions worth considering include:
- Are you taking medications?
- Do you have a thyroid condition?
- Are you experiencing unusual symptoms?
- Are you consuming very large amounts?
If lemon balm becomes a regular part of your routine, paying attention to how your body responds is a sensible approach.
What Happens If You Take Too Much Lemon Balm?
Excessive intake may increase the likelihood of side effects.
Possible symptoms may include:
- excessive sleepiness,
- digestive upset,
- headache,
- dizziness,
- fatigue,
- reduced alertness.
Very high doses are more likely to cause problems than the moderate amounts typically found in herbal tea.
For most people, more is not necessarily better.
Fresh vs Dried Lemon Balm: Does Safety Differ?
From a safety perspective, fresh and dried lemon balm are generally similar.
The main differences relate to aroma, flavor, and volatile oil content rather than safety.
Fresh lemon balm often contains:
- a stronger fragrance,
- more moisture,
- and a brighter flavor.
Properly dried lemon balm can still be excellent quality, especially when whole leaves are preserved during drying.
Heavily crushed herbs may lose aromatic compounds more quickly because more surface area is exposed to oxygen and light.
For a detailed comparison, read our guide: Fresh vs Dried Lemon Balm: Differences in Aroma, Benefits, and Uses.
Lemon Balm Side Effects in Children
Parents frequently ask whether lemon balm is safe for children.
In general, mild lemon balm tea is considered relatively low risk for older children when used appropriately, but children are more sensitive to herbs than adults.
Potential concerns include:
- excessive drowsiness,
- digestive discomfort,
- individual sensitivity reactions.
If you’re interested in age-specific guidance, see our article: Is Lemon Balm Safe for Kids? Benefits, Dosage, and Side Effects.
Parents of infants should also read: Can Babies Drink Lemon Balm Tea? Safety, Age, and What Parents Should Know.
When Should You Stop Using Lemon Balm?
Consider stopping lemon balm and seeking medical advice if you experience:
- allergic reactions,
- persistent digestive symptoms,
- unusual fatigue,
- severe dizziness,
- unexpected side effects,
- worsening symptoms despite use.
Herbal products should never be used as a substitute for professional medical care when symptoms require evaluation.
How to Reduce the Risk of Side Effects
A few simple precautions can help minimize problems:
Start With Small Amounts
Begin with a mild tea before trying stronger preparations.
Choose High-Quality Herbs
Whole dried leaves generally retain aroma and quality better than heavily powdered products.
Avoid Excessive Use
More herb does not automatically mean better results.
Check Medication Interactions
This is particularly important if you take prescription medications.
Pay Attention to Your Body
If something does not feel right, discontinue use and seek advice when necessary.
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Frequently Asked Questions
What are the most common lemon balm side effects?
The most commonly reported side effects include drowsiness, headache, nausea, dizziness, and digestive discomfort.
Can lemon balm make you sleepy?
Yes. Lemon balm is often used specifically because of its calming and relaxing properties.
Is it safe to drink lemon balm tea every day?
Many healthy adults drink lemon balm tea daily, though moderation is generally recommended.
Who should not take lemon balm?
People with thyroid conditions, those taking sedative medications, and individuals preparing for surgery should use extra caution.
Can lemon balm interact with medications?
Yes. Potential interactions may occur with sedatives, sleep medications, thyroid medications, and some other drugs.
Is lemon balm safe during pregnancy?
Pregnant women should consult their healthcare provider before using lemon balm regularly.
Can children drink lemon balm tea?
Some older children may tolerate mild lemon balm tea, but age and dosage should always be considered.
Sources
- European Medicines Agency (EMA) Herbal Monograph on Melissa officinalis
- National Center for Complementary and Integrative Health (NCCIH)
- PubMed Scientific Database
- Phytotherapy Research
- Journal of Ethnopharmacology
- Frontiers in Pharmacology
- Molecules
- Herbal Medicine: Biomolecular and Clinical Aspects
- American Academy of Family Physicians (AAFP)
