What are the side effects of Matcha?

Users most often report nausea, stomach issues, high fluoride, stomach discomfort, vomiting. Side effects came up 7 times across 104 reports.

User reports can't establish safety. PubMed lists 6 meta-analyses and 14 randomized trials. Talk to a doctor or pharmacist, especially if you take other medication.

Matcha side effects

Across 104 first-hand reports, people mentioned a side effect 7 times (about 7 per 100 reports). The most common: nausea, stomach issues, high fluoride. User reports show what people notice — they can't tell you whether Matcha is safe for you.

Reported side effects

nausea2

stomach issues1

high fluoride1

stomach discomfort1

vomiting1

insomnia1

In their own words

“I've recently tried cocoa powder mixed with matcha, incredible... It's a really clean stimulation with a lot of energy and I loved it!”

MixedRead the discussion ↗

“It doesn’t give me a crash like coffee or red bull. No sugars. Once in a while if I don’t keep track of how much I’ve had, and I go over 4 cups I get a little tummy ache.”

HelpedRead the discussion ↗

“I tried matcha, due to l-theanine content it's caffeine gets tamed but I find I still feel a moderate stimulation with matcha so I decided not to drink that either.”

Didn't helpRead the discussion ↗

Is Matcha safe? What the research covers

AResearch: Strong6 meta-analyses · 14 randomized trials on PubMed

Int J Mol Sci · 2025

Natural Products in Alzheimer's Disease: A Systematic Review of Clinical Trials and Underlying Molecular Mechanisms

Conclusion: Curcumin and Melissa officinalis had limited effects, resveratrol showed mixed outcomes with some side effects, and matcha green tea may improve cognition and sleep quality. Despite generally favorable results, the studies varied considerably in design and quality; nonetheless, herbal extracts represent a prominent category of natural interventions in AD and MCI, underscoring the need for further large-scale, high-quality clinical trials to confirm their therapeutic potential.