The measured range belongs to specific samples
Researchers selected matcha samples meeting sensory criteria from a larger collection and measured their composition. The theanine range was 9.30 to 28.51 mg/g. This was a food-composition study, not a clinical trial or a representative assay of every retail matcha. [1]
Multiply the assay by the powder mass
If a powder contains 20 mg/g and the serving contains two grams, the serving supplies 40 mg before any losses or incomplete consumption. Adding water changes concentration per milliliter, not the initial amount in that powder. A sweetened latte mix may contain much less actual matcha than its total scoop weight. [1][2]
Do not infer an exact amount from color or price
Origin, cultivation, processing and product selection can affect composition. Without a relevant assay, a typical estimate remains an estimate. Matcha also contains caffeine, so increasing powder to chase theanine increases other exposures too. [1][3]
A calculated intake is not a promised benefit
Imagine a two-gram serving is estimated at 40 mg of theanine. That does not make it equivalent to a purified supplement study using a different amount or composition. Enjoy the drink while keeping composition and clinical claims separate. [4]
| Input | Calculation |
|---|---|
| Assay | 20 mg per gram |
| Powder mass | 2 grams |
| Estimated theanine | 20 × 2 = 40 mg |
| Extra water | Dilutes concentration, not powder amount |
Sources for this article
- Variations of main quality components of matcha from different regions in the Chinese market - PMC
Source consulted: 2026-09-21. This is a reference resource, not a claim that we conducted the studies or tested a product. - Dietary Supplements: What You Need to Know
Source consulted: 2026-09-21. This is a reference resource, not a claim that we conducted the studies or tested a product. - Spilling the Beans: How Much Caffeine is Too Much? | FDA
Source consulted: 2026-09-21. This is a reference resource, not a claim that we conducted the studies or tested a product. - Frontiers | Effects of L-theanine on cognition, mood and sleep: evidence from human trials
Source consulted: 2026-09-21. This is a reference resource, not a claim that we conducted the studies or tested a product.