Article published on September 16, 2026.

It’s impossible to miss the alarmist videos circulating on social media about green tea, matcha, and iron. Between viral testimonials and oversimplifications, the topic raises a lot of questions—and quite a bit of confusion.

So we wanted to take a closer look at what the studies actually say—and, above all, give you some simple guidelines for incorporating our matcha into your routine without compromising your iron intake.

If you're new to matcha

Our Complete Guide to Matcha

→

Matcha and Iron: What's the Connection?

Matcha, like all green teas, is rich in polyphenols, particularly catechins—the compounds responsible for its antioxidant properties. These same molecules have the unique ability to bind to iron in certain foods in the intestine, thereby reducing its absorption.

To understand the issue, it’s important to know that there are two types of iron in our diet:

• Iron from meat (known as “heme” iron), found in meat, poultry, fish, and seafood: well absorbed (about 20 to 30%) and not significantly affected by tea.
  
  
• Plant-based iron (known as “non-heme” iron), found in legumes, whole grains, oilseeds, and green vegetables, as well as in eggs and dairy products: naturally less well absorbed (about 5 to 10%) and sensitive to polyphenols^[1][2].

The polyphenols in matcha bind to this second type of iron and form complexes that the intestine has difficulty absorbing. In practical terms, some of the plant-based iron in a meal becomes less bioavailable if matcha is consumed at the same time.

What Science Says: It's All About Timing




In 2017, a British research team measured iron absorption from a meal in twelve healthy women under three different conditions: with water, with a cup of black tea during the meal, and with the same cup of tea drunk one hour later^[4].

Result: When consumed during a meal, tea reduced the absorption of plant-based iron by about 37 percent. When consumed one hour later, the effect dropped to 18 percent—half as much. This study focused on black tea, not matcha, but the mechanism is the same for all teas rich in polyphenols. Earlier studies have confirmed this for green tea^[5], and for coffee, they have shown that waiting one hour before a meal also negates the effect^[6].

During meals: Who should be careful?



The effect is most noticeable at mealtime, but the actual impact depends on what's on your plate and your individual profile.

If your meal contains meat, poultry, or fish, drinking matcha while eating has little effect: the iron in these foods is not affected.

On the other hand, some people get most of their iron from plant foods, or have higher-than-average iron needs^[7]:

• Vegetarians and vegans;
  
  
• Women with heavy periods, the primary group at risk for iron deficiency in France;
  
  
• Pregnant women or women in the postpartum period;
  
  
• Teenage girls and children;
  
  
• Anyone whose blood test revealed a deficiency.
  
  

For people with these profiles, consistently drinking matcha in the middle of meals can, over time, affect their nutrient intake. The simple solution: save your matcha for another time of day.

The Best Time to Drink Matcha

• In the morning, before breakfast. For those who like to start the day with matcha, drinking it on an empty stomach is a good option, as long as you wait about an hour before eating an iron-rich breakfast (oatmeal, whole-grain bread, nuts). If your breakfast is on the lighter side or includes dairy, there’s little to worry about.
  
  
• Mid-morning or mid-afternoon. Around 10 a.m. or 4 p.m., matcha is consumed between the two main meals: this is the ideal time for a real break.
  
  
• During a meal. It’s fine if you eat meat or fish and aren’t among those with sensitivities. Otherwise, avoid making it a daily habit.

Three Tips to Refine Your Routine




• The right amount. A cup of matcha is made with 1 to 2 g of powder; a latte requires just a little more. It’s the amount of matcha—and only that—that determines what you consume: there’s no need to add more; it won’t make your cup any better.
  
  
• Vitamin C. Pairing meals rich in plant-based iron with a source of vitamin C (citrus fruits, kiwi, bell peppers, parsley, cabbage) significantly improves iron absorption and partially offsets the effect of polyphenols^[8][2].
  
  
• A reasonable amount. Two to three cups a day, spread out between main meals, let you enjoy matcha without worrying. Beyond that, it’s mainly the caffeine that calls for moderation.

In summary

Matcha and iron aren't incompatible—it's all a matter of timing. Whether you drink it on an empty stomach in the morning, mid-morning, or in the afternoon, your matcha ritual naturally fits into your day without interfering with your iron intake. If you're sensitive to iron, just make sure to leave an hour or two between your matcha and meals rich in iron.

This article is intended for informational purposes only and is not a substitute for medical advice. If you have a confirmed deficiency, experience unusual fatigue, or have any concerns, consult a healthcare professional.

Sources




^[1] Santé.fr (2024). Does drinking tea while eating prevent iron absorption? Ministry of Health. https://www.sante.fr/decryptage/nos-reponses/boire-du-en-mangeant-empeche-t-il-labsorption-du-fer

^[2] Hurrell, R., & Egli, I. (2010). Iron bioavailability and dietary reference values. The American Journal of Clinical Nutrition, 91(5), 1461S–1467S. https://doi.org/10.3945/ajcn.2010.28674F

^[3] Meyer, S., et al. (2023). Catechin composition, phenolic content, and antioxidant properties of commercially available bagged, gunpowder, and matcha green teas. *Plant Foods for Human Nutrition*, 78, 662–669. https://doi.org/10.1007/s11130-023-01121-2

^[4] Ahmad Fuzi, S. F., Koller, D., Bruggraber, S., Pereira, D. I. A., Dainty, J. R., & Mushtaq, S. (2017). A 1-hour interval between a meal containing iron and tea consumption attenuates the inhibitory effects on iron absorption: a controlled trial in a cohort of healthy UK women using a stable iron isotope. The American Journal of Clinical Nutrition, 106(6), 1413–1421. https://doi.org/10.3945/ajcn.117.161364

^[5] Samman, S., et al. (2001). Green tea or rosemary extract added to foods reduces nonheme iron absorption. The American Journal of Clinical Nutrition, 73(3), 607–612. https://doi.org/10.1093/ajcn/73.3.607

^[6] Morck, T. A., Lynch, S. R., & Cook, J. D. (1983). Inhibition of food iron absorption by coffee. The American Journal of Clinical Nutrition, 37(3), 416–420. https://doi.org/10.1093/ajcn/37.3.416

^[7] ANSES. Iron and Nutritional References for Vitamins and Minerals (2021). https://www.anses.fr/fr/content/le-fer

^[8] Siegenberg, D., et al. (1991). Ascorbic acid prevents the dose-dependent inhibitory effects of polyphenols and phytates on nonheme iron absorption. The American Journal of Clinical Nutrition, 53(2), 537–541. https://doi.org/10.1093/ajcn/53.2.537

^[9] EFSA (2015). Scientific opinion on the safety of caffeine. EFSA Journal, 13(5), 4102. https://doi.org/10.2903/j.efsa.2015.4102