L-theanine L-テアニン
A type of amino acid found in green tea.
In Japan: Foods with Function Claims notifications
Functions claimed (counted from notifications with this ingredient alone)
| Function | Notifications |
|---|---|
| Sleep quality | |
| Fatigue | |
| Stress and tension | |
| Memory and cognitive function |
Examples of notified claims (our translation)
This product contains "L-theanine." L-theanine has been reported to support good-quality sleep at night (reducing tiredness and sleepiness upon waking).
This product contains L-theanine. L-theanine has been reported to have the function of supporting good-quality sleep at night (reducing tiredness and sleepiness upon waking) and the function of easing temporary stress (mental strain) caused by tasks and the like.
This product contains L-theanine. L-theanine has been reported to support good-quality sleep (reducing tiredness and sleepiness upon waking) and to have the function of easing temporary stress caused by tasks and the like.
Cautions written in the notifications (most common)
- “If you are taking medication for high blood pressure or stimulants in particular, consult your doctor.” (5 notifications)
- “If you are taking medication for high blood pressure or stimulants, consult your doctor.” (3 notifications)
- “If you are taking medication for high blood pressure or stimulants, avoid taking this product.” (2 notifications)
- “If you are taking blood pressure-lowering drugs or stimulants, consult your doctor.” (2 notifications)
Under Foods with Function Claims, the company notifies the Consumer Affairs Agency of the scientific evidence on its own responsibility; the government does not review or approve it. You can look up each product's notification by the number on the package in the Consumer Affairs Agency's database (Japanese).
In the EU: the register of health claims
Claim not authorised in the EU
- The "sleep," "stress," "cognitive function," and "premenstrual discomfort" claims were not authorised because EFSA found them not substantiated (2011 opinion).
In the EU, only health claims whose evidence has been assessed by the European Food Safety Authority (EFSA) and authorised by the European Commission may be used on food. “Not authorised” means the evidence for that claim was not established under EU standards — not that the ingredient is dangerous.
Find products PR
These are Japanese online shops (affiliate links).
Example of a product notified with this ingredient
ネナイト （アサヒグループ食品株式会社）
Food with Function Claims, notification No. B306. Chosen from products sold on Rakuten whose names match a current notification to the Consumer Affairs Agency, picking one with many reviews.
See on Rakuten (stacon)See on Amazon.co.jpThis database does not guarantee any product's effect. For Foods with Function Claims, check the notification number on the package; for Foods with Nutrient Function Claims, check the amount per daily serving.
Compare “テアニン サプリ” products on RakutenCompare “テアニン サプリ” products on Amazon.co.jpOther ingredients in the same categories
This page is a translation of our Japanese page; if they differ, the Japanese page is the reference.