Person whisking matcha powder.

The Side Effects of Too Much Matcha: What You Need to Know

Written by: Mecene Research Team

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Published

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Time to read 8 min

Matcha green tea has gained worldwide popularity for its vibrant green color, smooth flavor, and many health benefits, from boosting metabolism to providing a sustained energy boost. Unlike regular green tea, matcha tea is made by consuming the entire powdered green tea leaf, delivering a more concentrated source of antioxidants and nutrients.


Matcha lattes, smoothies, and traditional tea have become a staple for those seeking a healthy lifestyle. However, while matcha offers numerous health perks, drinking too much matcha can lead to some unexpected side effects. In this article, we'll explore what happens when you drink too much matcha and the potential risks of overconsumption.

What is Matcha?

Matcha is a type of powdered green tea made from finely ground tea leaves, specifically from the same plant used to make traditional green tea. However, unlike regular brewed green tea, where you steep the leaves and discard them, matcha green tea powder is whisked directly into hot water.


This means consuming the entire leaf makes matcha much more concentrated than traditional green tea. It's often used in traditional Japanese tea ceremonies, but today, matcha is enjoyed in everything from lattes to smoothies, and matcha powder is a common ingredient in various recipes.


The unique components of matcha contribute both to its health benefits and potential risks. Matcha is rich in antioxidants, particularly a type called catechins, which help neutralize free radicals in the body. It also contains a high level of caffeine compared to regular green tea, along with L-theanine, an amino acid known to promote relaxation while enhancing focus.


However, the concentrated caffeine content can lead to side effects if you drink too much matcha, especially for those with caffeine sensitivity. Organic matcha or premium matcha varieties can help ensure you’re consuming a higher-quality product, reducing the risk of potential contaminants.

Cup of matcha green tea.

Benefits of Moderate Matcha Consumption

Drinking matcha in moderation can offer many health benefits, making it a great addition to a healthy lifestyle. Here are some of the key advantages of moderate matcha consumption:


  • Sustained Energy Boost: Unlike coffee, matcha provides a smoother, longer-lasting energy boost without the jitters, thanks to its combination of caffeine and L-theanine. This helps regulate energy levels throughout the day.

  • Rich in Antioxidants: Matcha is packed with powerful antioxidants, particularly catechins, which can neutralize free radicals, support overall health, and help promote liver health.

  • Enhanced Focus and Relaxation: Matcha’s amino acid L-theanine promotes relaxation while improving focus, making it an excellent drink for supporting concentration and mental clarity.

  • Boosts Metabolism : Consuming matcha may help boost metabolism and promote fat burning, which can support weight management as part of a healthy diet.

  • Supports Heart Health : Regularly drinking matcha tea may help regulate blood sugar levels and support heart health by reducing blood pressure and lowering bad cholesterol.

Stirring a cup of matcha tea.

"Matcha’s amino acid L-theanine promotes relaxation while improving focus..”

Potential Side Effects of Excessive Matcha Intake

While matcha offers many health benefits when consumed in moderation, drinking too much matcha can lead to several adverse side effects. These issues often stem from its high caffeine content and other compounds found in matcha tea powder.

Caffeine Overload

Consuming too much matcha tea can result in an overload of caffeine, leading to various symptoms, including:


  • Jitteriness: High caffeine levels can cause feelings of restlessness or shakiness.

  • Insomnia: Drinking too much matcha, especially late in the day, can make it difficult to fall asleep.

  • Heart Palpitations: Excessive caffeine intake can lead to an abnormal or racing heartbeat.

  • Increased Anxiety: Matcha’s caffeine content may heighten anxiety in those sensitive to stimulants.


Matcha contains more caffeine than regular brewed green tea but has less caffeine than a cup of coffee. However, since you consume whole powdered green tea leaves, matcha's caffeine effects can be more potent, especially if you drink too much matcha in one day. A cup of matcha offers about 70 milligrams of caffeine, while coffee averages 95 milligrams.

Caffeine overload causing insomnia.

Digestive Issues

Drinking too much matcha can also lead to digestive problems, such as an upset stomach or constipation. This is mainly due to the high levels of tannins found in matcha green tea powder. Tannins can irritate the lining of the stomach, leading to discomfort, especially when consumed on an empty stomach. Many people who drink matcha on an empty stomach experience nausea or digestive distress.


In addition, tannins may slow down the digestive process, leading to constipation in some individuals. Drinking matcha tea in moderation and pairing it with food can help reduce these digestive side effects.

Matcha powder with bamboo whisk in the background and a tea kettle.

Impact on Iron Absorption

One lesser-known side effect of excessive matcha consumption is its potential to interfere with iron absorption. The tannins in matcha, which are beneficial in small amounts, can bind to the iron in your diet and make it harder for your body to absorb this essential mineral. This is especially concerning for those with low iron levels or who are at risk of iron deficiency.


Over time, drinking too much matcha could lower the body's iron stores, potentially leading to symptoms like fatigue, dizziness, and weakness. To reduce this risk, avoiding matcha tea during meals is generally recommended, especially if you’re eating iron-rich foods.

Lead Contamination Concerns

Another potential concern with matcha is the risk of lead contamination. Since matcha is made from the whole tea leaf, it can absorb heavy metals, including lead, from the environment where it’s grown. This is especially true of tea plants grown in industrial regions. When you drink matcha, you're consuming all the lead present in the leaf, which could lead to harmful exposure over time.


It's important to choose high-quality matcha, such as organic matcha or premium matcha varieties, to minimize the risk of lead contamination. Reputable brands often test their matcha green tea powder for contaminants, ensuring a safer product for regular consumption.

How Much Matcha is Too Much?

When it comes to matcha intake, moderation is key. Here are some general guidelines on how much matcha is safe to drink:


  • One to Two Cups Per Day: It is generally recommended that matcha intake be limited to one or two cups per day.

  • Caffeine Limit: Keep your total caffeine intake from all sources, including matcha, below 400 milligrams daily.

  • Pregnant Women: Pregnant women should limit matcha and other caffeinated beverages to avoid complications.

  • Caffeine Sensitivity: If you’re sensitive to caffeine, consider reducing your matcha intake to avoid side effects.

  • Age and Health: Older adults or individuals with health conditions like high blood pressure should consult a doctor before increasing their matcha consumption.


Individual tolerance to matcha can vary based on factors like body weight, age, and general health. For example, those with a higher caffeine tolerance may be able to drink too much matcha without experiencing side effects. However, younger people or those with underlying health issues, such as liver damage or high blood pressure, may need to be more cautious about their matcha consumption

Green tea leaves.

Additionally, caffeine-sensitive individuals may feel the effects of even one cup of matcha more strongly than others, making monitoring how your body responds important.

Managing and Preventing Negative Effects

If you love drinking matcha but want to avoid the side effects, here are some tips for responsible consumption:


  • Stick to Recommended Limits: Keep your matcha intake within the suggested daily limits to avoid overconsumption.

  • Avoid Drinking Matcha on an Empty Stomach: This can help prevent stomach upset and nausea.

  • Choose High-Quality Matcha: Opt for organic or premium matcha to reduce the risk of contaminants like lead.

  • Balance with Water: Drink plenty of water to stay hydrated and help flush out excess caffeine.

  • Monitor Your Caffeine Intake: Keep track of all caffeinated beverages you consume to avoid exceeding your limit.


If you experience side effects from drinking too much matcha, the first step is to reduce your matcha intake or stop altogether. Make sure to drink plenty of water to stay hydrated, and if symptoms persist, such as prolonged insomnia or digestive issues, consult a healthcare provider for guidance.

Woman drinking a glass of water.

Enjoy Matcha Responsibly for Optimal Health

While matcha green tea offers many health benefits, from boosting metabolism to providing a sustained energy boost, drinking too much matcha can lead to unwanted side effects. These include caffeine overload, digestive issues, and even the risk of iron deficiency or lead exposure.


The key is to enjoy matcha in moderation, paying attention to your body’s signals and adjusting your matcha intake accordingly. By doing so, you can reap the many benefits of matcha while avoiding the potential risks.

Frequently Asked Questions

Can drinking matcha on an empty stomach cause issues?

Yes, consuming matcha on an empty stomach may cause nausea or an upset stomach due to its tannin content.

How do I switch to matcha powder from coffee without side effects?

Start by gradually reducing your coffee intake while slowly incorporating matcha into your routine to avoid caffeine withdrawal.

What are the signs that I might be sensitive to matcha powder?

Common signs include jitteriness, headaches, insomnia, or digestive issues after drinking matcha.

How many cups of matcha are safe to drink per day?

Consuming one or two cups of matcha daily is generally recommended to avoid overconsuming caffeine.

Can matcha affect iron levels in the body?

Yes, the tannins in matcha can interfere with iron absorption, especially if consumed in large amounts or during meals.

REFERENCES

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Medically Reviewed By

Dr. James Pendleton

Dr. James Pendleton is a primary care physician specializing in a naturopathic approach to family medicine. He has nurtured a family practice in Seattle, directed a VIP medical center in Abu Dhabi, published several books and scientific articles, and designed innovative nutritional supplements for manufacturers worldwide.