What Are the Downsides of Matcha? An Honest Guide

Most matcha content focuses exclusively on benefits. The downsides are real, relevant, and worth knowing — not to discourage consumption, but to help you make informed choices about when, how much, and whether matcha is right for you.

It contains significant caffeine

A serving of matcha contains 30–70mg of caffeine. For caffeine-sensitive people this causes jitteriness, anxiety, heart palpitations, or sleep disruption. L-theanine moderates the effect but does not eliminate caffeine. If you are sensitive to caffeine, matcha may not be the right daily drink.

It is expensive at quality levels

Good ceremonial grade matcha costs significantly more than most other teas. This is justified by production costs, but it is a real barrier. Cheap matcha is a poor substitute — more bitter, less nutritious, less pleasant — but the cost of quality matcha adds up for daily consumption.

It can inhibit iron absorption

The catechins in matcha inhibit non-haem iron absorption when consumed with meals. For people managing iron deficiency, this requires timing awareness. Drinking matcha between meals rather than with food substantially reduces the effect.

It degrades quickly once opened

Unlike dried herbs or many other teas, matcha begins losing quality from the moment it is ground. An opened tin should be consumed within four to eight weeks. This means buying in small quantities regularly — which adds to the cost.

Not everyone enjoys the flavour

The grassy, umami character of matcha is genuinely not for everyone. The adjustment period can take multiple attempts, and some people simply prefer different flavours. This is not a flaw — it is a preference.

Excessive intake carries risks

Very high daily consumption — four or more cups — is associated with excessive caffeine and, in rare cases, liver enzyme elevation from very high EGCG. One to two cups daily is the sensible range for most adults.