Could Matcha Really Affect Your Menstrual Cycle? Pharmacist Sparks Debate

The internet is full of health advice, and it can be overwhelming to separate fact from fiction. The latest discussion centers around matcha, the vibrant green tea powder that has become a favorite in cafés worldwide.

A pharmacist on TikTok has sparked concern by warning that drinking matcha could potentially interfere with women’s menstrual cycles. Matcha is made by finely grinding specially grown green tea leaves.

Beyond its striking color, it has gained popularity for its antioxidants, calming amino acids, and reputation as a healthier caffeine source than coffee. But TikTok pharmacist @syahfarmasi claims there may be a downside, especially for women.

According to him, each cup of matcha contains about 70 milligrams of caffeine.

"Excessive caffeine intake can interfere with the body's production of progesterone and estrogen," he explained. This hormonal disruption, he added, might lead to irregular periods, stronger menstrual pain, mood swings, or general instability in the menstrual cycle.

Syah suggested that anyone struggling with irregular cycles try cutting matcha out for one to two weeks to see if it makes a difference.

However, not everyone agrees. Other health experts and outlets argue that matcha may actually offer benefits during menstruation.

Matcha.com notes that its blend of antioxidants, L-theanine, and gentle energy boost can help reduce fatigue, ease inflammation, and even stabilize mood.

Menstrual care brand Lunette also highlights potential benefits, such as easing cramps, boosting energy, and reducing mood swings

A pharmacist has issued a warning to matcha-lovers during their period

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Japanese registered dietitian Asako Miyashita supports this perspective, saying that matcha "helps reduce cramping. It is good for your body, especially during menstruation."

Similarly, tea brand Ooika points out that drinking normal amounts of matcha is unlikely to cause negative effects. The main concern, they note, is caffeine — but only in excessive amounts.

So how does caffeine actually affect the body during menstruation? In general, caffeine stimulates the central nervous system. When consumed in high doses, it can cause anxiety, disrupt sleep, and intensify mood swings.

During a period, these symptoms may feel even stronger. Caffeine can also constrict blood vessels by blocking adenosine, a hormone that helps regulate blood flow, which in theory might worsen cramps.

Other health bodies and outlets have contradicted the pharmacist's advice

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But the amount of caffeine in matcha is relatively low compared to coffee. A typical cup of matcha contains between 25 and 70 milligrams, while a cup of coffee averages 70 to 140 milligrams.

The U.S. Food and Drug Administration (FDA) considers up to 400 milligrams of caffeine per day safe for healthy adults — the equivalent of about four cups of coffee. For most people, a serving or two of matcha falls well within that safe range.

Another key difference is how caffeine in matcha is absorbed. Thanks to L-theanine, an amino acid naturally found in tea, the energy boost is released more slowly and steadily than coffee. Many drinkers report fewer jitters and less of a “crash” effect.

The 'potentially troublesome' compound people worry about in matcha tea is caffeine

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This does not mean the TikTok pharmacist’s warning should be dismissed entirely. As with many foods and drinks, moderation is key. Too much caffeine from any source can put stress on the body and potentially disrupt hormones.

But for most people, a daily matcha latte or two is unlikely to throw their cycle off track — and may even help ease symptoms.

In short, matcha can be both friend and foe depending on how much you drink. If you notice changes in your menstrual cycle and consume a lot of caffeine, cutting back may help. Otherwise, enjoying matcha in moderation remains a safe and even beneficial habit.