What is the Side Effect of Spearmint Tea? A Guide to Potential Risks

January 10, 2026 •

3 min read

While spearmint tea is widely praised for its soothing properties and potential health benefits, it's not without risks, especially when consumed excessively or by certain individuals. Most people tolerate moderate intake well, but it is important to be aware of the potential adverse effects associated with high doses or specific health conditions.

Quick Summary

Understand the potential downsides of spearmint tea, including hormonal impacts, digestive discomfort, and adverse effects on liver and kidney health. Learn about possible interactions with medications and discover who should exercise caution before regular consumption.

Key Points

Hormonal Impacts: Spearmint tea can lower testosterone levels, which is useful for conditions like PCOS but may affect libido in men when consumed in high doses.
Digestive Upset: In large amounts, the tea can relax the lower esophageal sphincter, potentially worsening symptoms of acid reflux and GERD.
Liver and Kidney Risks: High, concentrated doses of spearmint can cause damage to the liver and kidneys, especially in individuals with existing organ disease.
Drug Interactions: Spearmint may interact with certain medications, including sedatives and drugs processed by the liver, potentially increasing their effects.
Allergic Reactions: Though rare, some individuals may experience allergic reactions such as skin rashes or hives.
Pregnancy Concerns: Excessive amounts of spearmint tea are potentially unsafe during pregnancy and should be avoided.

Common Side Effects of Spearmint Tea

Although considered generally safe in moderate amounts, excessive intake of spearmint tea can trigger several adverse effects, ranging from mild discomfort to more serious health concerns. Most of these issues are associated with high dosages, which is why moderation is key when incorporating this herbal tea into your daily routine.

Hormonal Changes and Anti-Androgenic Effects

One of the most widely discussed side effects of spearmint tea relates to its anti-androgenic properties, which means it can reduce the levels of androgens (male hormones like testosterone). While this is beneficial for conditions like hirsutism or PCOS in women, it can cause problems for others. Men, in particular, may experience a decrease in libido or other effects associated with lower testosterone if they consume large quantities of the tea over a long period.

Digestive Issues and GERD

For individuals with sensitive stomachs or pre-existing digestive disorders, spearmint tea can cause or worsen symptoms. The relaxing effect mint has on the lower esophageal sphincter (LES) can lead to or aggravate:

Heartburn: The relaxed LES allows stomach acid to flow more easily into the esophagus.
Acid reflux: A common issue for people with gastroesophageal reflux disease (GERD).
Digestive discomfort: Excessive intake can irritate the mucosal lining of the stomach.

Liver and Kidney Health Risks

High doses of spearmint tea can pose risks to liver and kidney function, particularly for those with pre-existing conditions. Animal studies have indicated that very high, prolonged consumption can cause damage to these organs. While tea consumption in standard amounts is generally not an issue, individuals with liver or kidney disorders should consult a doctor before making it a regular habit.

Allergic Reactions and Drug Interactions

As with any herbal product, there is a risk of allergic reaction, though it is rare. Symptoms can include hives, skin rashes, or an itchy mouth. Furthermore, spearmint can interact with certain medications and supplements.


Comparison of Spearmint Tea Effects	Effect/Condition	Low to Moderate Intake (1-2 cups/day)	High or Excessive Intake (4+ cups/day or concentrated supplements)
Hormonal Balance	May help balance hormones in women with PCOS by reducing androgens.	Can lead to significant testosterone reduction, potentially causing reduced libido in men or other hormonal issues.
Digestive Health	Often soothes digestion, bloating, and nausea due to antispasmodic properties.	May trigger or worsen GERD, acid reflux, and general stomach irritation.
Liver Health	Considered safe for healthy individuals.	High risk of liver damage, especially for those with pre-existing liver disease or taking hepatotoxic drugs.
Kidney Health	Considered safe for healthy individuals.	Increased risk of kidney damage, especially with pre-existing kidney disorders.
Pregnancy	Avoid high doses; consult a doctor.	Potentially unsafe due to risk of uterine damage and other complications.
Drug Interactions	Minimal risk, but caution is advised.	Increased risk of interactions with sedatives, hepatotoxic drugs, and hormonal agents.

Contraindications and Precautionary Measures

For many, spearmint tea is a harmless and enjoyable beverage. However, several groups should approach its consumption with caution or avoid it entirely. These individuals include pregnant and breastfeeding women, men concerned about their testosterone levels, and anyone with a history of liver or kidney disease. The concentration of spearmint in supplements is also much higher than in tea, and therefore carries greater risk.

It is important to heed the advice of healthcare professionals, especially if you are taking medications. Spearmint can interact with sedative medications, potentially causing excessive drowsiness, and with drugs metabolized by the liver, potentially increasing the risk of liver damage. Consulting with a doctor can help determine a safe dosage and ensure no negative interactions occur.

Conclusion

Spearmint tea, while generally safe and beneficial in moderation, is not without potential side effects. Excessive consumption can lead to hormonal imbalances, especially affecting testosterone levels. For those with conditions like GERD, it can worsen digestive symptoms. Critical health risks to the liver and kidneys exist with very high doses, particularly for individuals with pre-existing health issues. The key is to be mindful of your intake and to consult a healthcare provider, especially if you fall into a high-risk group or are taking other medications. Always prioritize caution and moderation to enjoy the pleasant and mild benefits of spearmint tea safely.

Visit WebMD for more information on spearmint's uses and precautions.

Frequently Asked Questions

Yes, spearmint tea has anti-androgenic effects and can reduce testosterone levels, which may diminish libido or cause other hormonal effects in men if consumed in high quantities over time.

For people with pre-existing digestive issues like GERD, spearmint tea can worsen symptoms like acid reflux and heartburn because it can relax the lower esophageal sphincter, allowing stomach acid to flow back up.

No, it is recommended to avoid large or excessive amounts of spearmint tea during pregnancy. High doses are potentially unsafe as they might damage the uterus, so it is best to consult a healthcare provider.

Excessive intake, particularly of concentrated supplements, can cause liver and kidney damage. Individuals with pre-existing liver or kidney disease should be cautious and seek medical advice before consumption.

Yes, spearmint can interact with medications processed by the liver and with sedatives (CNS depressants), potentially increasing their sedative effects. Always consult a doctor if you are on medication.

For most healthy individuals, drinking one to two cups of spearmint tea per day is considered safe and well-tolerated. Excessive consumption beyond this is where the potential for side effects increases.

Although rare, some people may have an allergic reaction to spearmint, a member of the mint family. Symptoms can include skin rashes or hives. If this occurs, stop consuming the tea immediately.