Matcha and medication: what should you look out for?
09-09-2026 · 6 min read
Reading time: 7 minutes · Last updated: June 2025
Matcha and medication is a topic that is surprisingly rarely written about, even though millions of people use both tea and medication daily. Matcha is a concentrated green tea powder that contains bioactive compounds (such as EGCG, L-theanine, and catechins) that can interact with certain medications. In this article, you will read about which combinations require attention, what science says, and when it is better to consult your doctor.
Why matcha and medication is a relevant topic
There are over 5.7 million chronic medication users in the Netherlands (source: RIVM, Volksgezondheidenzorg.info). At the same time, matcha is one of the fastest-growing drinks in our country. It is logical that more and more people are wondering whether matcha and medication can safely be used together.
The difference from loose green tea is the concentration. With matcha, you consume the whole leaf, finely ground into powder. One cup of ceremonial matcha (1.5 to 2 grams) contains an average of 60 to 70 mg of caffeine and approximately 137 times more EGCG (epigallocatechin gallate) per gram than some conventional green tea varieties. That makes matcha more powerful, but also more relevant when it comes to drug interactions.
Known interactions between matcha and medication
Blood thinners (warfarin, acenocoumarol)
Matcha contains vitamin K, a substance that promotes blood clotting. This conflicts with the action of vitamin K antagonists such as warfarin and acenocoumarol. One gram of matcha already contains approximately 29 micrograms of vitamin K. With a daily portion of 1.5 to 2 grams, this amounts to 44 to 58 micrograms, which can noticeably influence your INR value. A study published in the Journal of General Internal Medicine (2005) documented significant INR drops in patients who started drinking green tea alongside warfarin.
Do you use a blood thinner? Always discuss your matcha intake with your thrombosis service so they can monitor your dosage.
Iron supplements and iron absorption
The catechins in matcha (particularly EGCG) bind to non-heme iron in your stomach and intestines. Research shows that simultaneous intake of green tea can lower iron absorption by 20 to 35%. This is especially relevant for people with anemia or an iron deficiency. The solution is simple: drink your matcha at least 2 hours before or after your iron supplement.
Beta-blockers and blood pressure medication
Caffeine can temporarily reduce the blood pressure-lowering effect of beta-blockers such as metoprolol. Matcha contains an average of 60 to 70 mg of caffeine per cup, considerably less than an espresso (approximately 120 to 170 mg), but enough to have an effect. A meta-analysis in the American Journal of Clinical Nutrition (2011) showed that caffeine can briefly increase systolic blood pressure by 3 to 15 mmHg. With matcha and blood pressure, however, L-theanine plays a dampening role, which makes the spike less sharp than with coffee.
MAO inhibitors (certain antidepressants)
Classic MAO inhibitors (such as phenelzine) have strict dietary requirements. Although matcha is not a tyramine-rich food, the caffeine in combination with MAO inhibitors can lead to increased blood pressure and headaches. Always consult your prescribing physician.
Other medications
EGCG can influence the activity of certain liver enzymes (particularly CYP3A4 and CYP1A2). These enzymes are involved in the breakdown of dozens of medications, from simvastatin to certain antibiotics. In practice, the concentration of EGCG from 1 to 2 cups of matcha per day is usually too low for clinically relevant effects, but at higher dosages or with concentrated supplements, the risk increases.
Comparison table: matcha vs coffee when using medication
| Factor | Matcha (1.5-2 g) | Coffee (150 ml filter coffee) |
|---|---|---|
| Caffeine per serving | 60-70 mg | 80-120 mg |
| L-theanine | 25-40 mg | 0 mg |
| Vitamin K per serving | 44-58 mcg | Negligible |
| EGCG per serving | 60-100 mg | 0 mg |
| Iron absorption effect | Inhibitory (catechins) | Slightly inhibitory (tannins) |
| Blood pressure spike | Dampened by L-theanine | Sharper, faster |
This comparison shows that matcha is milder than coffee in some areas (caffeine spike, blood pressure), but requires more attention in others (vitamin K, EGCG). Anyone who switches from coffee to matcha and uses medication would do well to discuss this with a pharmacist.
Practical guidelines for safe combining
- Timing: Drink your matcha in the morning and take medication at the prescribed time, preferably with at least 2 hours in between.
- Dosage: Stick to 1 to 2 cups of matcha per day (1.5 to 2 grams per cup). Do not use concentrated EGCG supplements alongside medication without medical advice.
- Consistency: Especially with blood thinners, consistent intake of vitamin K is more important than complete avoidance. Drink the same amount of matcha every day so your doctor can adjust the dosage.
- Preparation: Always prepare your matcha with water at 70 to 80 degrees and whisk it with a chasen or electric whisk. Boiling water breaks down certain catechins more quickly, but can actually concentrate other substances.
- Communication: Report your matcha use to your GP, specialist, or thrombosis service, just as you would with other herbal supplements.
What matcha cannot do (and a fair nuance)
Online, claims circulate that matcha can replace medication for depression, high blood pressure, or diabetes. Let's be clear about that: matcha is a food, not a medicine. The bioactive compounds in matcha (L-theanine, EGCG, catechins) are scientifically interesting, but no research justifies stopping or reducing prescribed medication based on matcha consumption.
Unmatched Matcha encourages you to see matcha as part of a healthy lifestyle, not as a replacement for medical care. If you are in doubt about the combination of matcha and medication, your doctor or pharmacist is always the best source.
Medical disclaimer: this article is intended to be informative and does not replace medical advice. Always consult your doctor or pharmacist in case of complaints or doubts.
Unique insights you rarely read elsewhere
What many sources do not mention: the quality of matcha influences the interaction. Ceremonial matcha from the first harvest (ichibancha) from Kagoshima, grown on mineral-rich volcanic soil near the Sakurajima, generally contains a higher L-theanine content and a slightly different catechin profile than later harvests or industrially produced powder. That higher L-theanine content (up to 40 mg per serving) dampens the caffeine spike more strongly, which is theoretically more favorable for users of blood pressure medication.
In addition, Unmatched Matcha uses stone-ground, organic matcha without additives, which means you do not consume unknown ingredients that might have their own interactions. With cheaper variants containing sugars, colorings, or fillers, that risk is greater. Want to be sure what is in your matcha? Then check out the ceremonial matcha 30g, ideal for getting started.
Frequently asked questions
Can I drink matcha if I use blood thinners?
Yes, but with attention. Matcha contains vitamin K, which can influence the effect of blood thinners like warfarin. Keep your intake consistent and discuss it with your thrombosis service so they can monitor your INR value.
How many hours should be between matcha and medication?
As a rule of thumb, keep at least 2 hours between drinking matcha and taking medication. This applies especially to iron supplements and thyroid medication.
Is matcha safer than coffee when using medication?
That depends on the medication. Matcha contains less caffeine and has L-theanine that dampens the spike effects, but it also contains vitamin K and EGCG, which are more relevant for specific medications (blood thinners, iron tablets) than coffee.
Can matcha influence the effect of antidepressants?
With MAO inhibitors, caution is advised because of the caffeine. With SSRIs and SNRIs, there are no known clinically relevant interactions with matcha in normal dosages (1 to 2 cups per day). When in doubt, always consult your doctor.
How much matcha per day is safe alongside medication?
For most people, 1 to 2 cups (each 1.5 to 2 grams) per day is safe. Avoid concentrated EGCG supplements and discuss higher intakes with your healthcare provider. You can read more about daily amounts in our article on how much matcha per day.
