This time of year someone asks us about matcha for immunity almost every day. Usually they've read something online that promised a lot, and they want to know if it's true. We'd rather give you the straight answer than sell you a tin on a promise. Matcha doesn't make you immune to anything, and no drink stops the flu on its own. But there's some genuinely interesting science behind it, and a few real ways it can help you get through flu season feeling a bit more human.
Matcha for immunity: what the research says
Your immune system isn't a single dial you can turn up, which is partly why immunity boosting is such a slippery phrase. You'll see it on a lot of packaging. It promises more than anyone can honestly back up.
What matcha does have is a lot of catechins, a group of antioxidants found in tea leaves. Because you whisk the powdered leaf into water and drink the whole thing, you get more of them than you would from a steeped green tea bag. The best known is EGCG, and researchers have spent years looking at how it behaves around viruses, including influenza. Some of those results are genuinely interesting.
The catch is that most of that work was done in lab dishes, and a petri dish isn't a person. There's also been research in Japan on green tea catechins and gargling with green tea to see if they reduce colds and flu, and the results have been mixed. So our honest take is this: promising, not proven. Keep drinking your matcha, and keep your flu shot appointment too.
Where matcha actually helps in flu season
Here's the part we're more confident about. Sleep and stress both make a real difference to how well your body copes with getting sick. Matcha won't fix either, but it can help you avoid making them worse.
Matcha contains L-theanine, an amino acid that's been studied a fair bit alongside caffeine. Together they tend to give you a calmer, steadier alertness than coffee does. No jittery spike, no 3pm wall. When you're dragging through a week of a stuffy nose and still have deadlines, that's worth a lot.
But caffeine is still caffeine. A 2g serving has roughly as much as a small cup of coffee, and the L-theanine doesn't cancel that out at bedtime. So drink it in the morning, and if you're sensitive, stop by noon. On days you feel rough, try half a scoop whisked thin instead of your usual strong bowl. Your sleep matters more than your second matcha.
And don't underrate the simple stuff. A warm drink feels good on a scratchy throat, and staying hydrated helps when you're unwell. Keep your water at 70 to 80°C, though. Boiling water scorches the powder and turns it bitter, which is the last thing a sore throat needs.
Our cold-morning bowl
When one of us starts coughing, this is what we make at home. No milk, so it stays light.
- Sift 1 teaspoon (about 2g) of matcha into your bowl.
- Finely grate a thumbnail-sized piece of fresh ginger and press the juice through a tea strainer into the bowl.
- Pour in 70ml of water at around 75°C and whisk in a quick zigzag until you've got a fine foam.
- Stir in half a teaspoon of honey once it's cool enough to sip.
Honey has decent evidence behind it for calming a cough, which is more than most home remedies can say. Just don't give it to children under one. The ginger is mostly for warmth and flavor (it's also very good at clearing your head for a minute).
If you're settling into a daily bowl for the colder months, a 30g tin at one scoop a day lasts about two weeks. Worth reordering before you're stuck in bed and out of tea.
One last thing, said plainly because we sell tea and not medicine. If you've got a high fever, trouble breathing, or you're getting worse after a few days, see a doctor. Make your bowl before lunch and go to bed early. That part's free.