Quick answer
A cup of tea is often estimated to contain roughly 5–20mg of L-theanine, depending on the tea and how it's brewed, with matcha and shade-grown teas at the higher end. An L-theanine supplement typically provides 200mg or 400mg per serve, a far larger and more precise amount.
Why tea varies so much
- Tea type: shade-grown teas (gyokuro, matcha) tend to contain more L-theanine.
- Leaf grade: young leaves and buds generally contain more than older leaves.
- Brewing: water temperature, steeping time and the amount of leaf all change how much ends up in your cup.
- Matcha: you consume the whole powdered leaf rather than an infusion.
Tea vs supplement at a glance
| Source | Approx. L-theanine | Caffeine? |
|---|---|---|
| Cup of black tea | Roughly 5–20mg (varies) | Yes |
| Cup of green tea | Roughly 5–20mg (varies) | Yes |
| Matcha | Often higher per serve (varies) | Yes |
| MAYN L-Theanine 200mg capsule | 200mg | No |
| MAYN L-Theanine 400mg serve | 400mg | No |
Tea figures are rough estimates and differ between studies, brands and brewing methods.
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Why people choose a supplement
A supplement gives a measured, consistent amount and contains no caffeine. Tea is a pleasant drink with its own appeal, but the L-theanine content is unpredictable.
Frequently asked questions
Does decaf tea contain L-theanine?
Decaffeinated tea still contains some L-theanine, although processing can reduce it.
How many cups of tea equal a 200mg L-theanine capsule?
Based on rough estimates of 5–20mg per cup, it would take many cups of tea. Tea amounts vary too much to give an exact number.
Do L-theanine supplements contain caffeine?
No, unless caffeine is listed on the label. MAYN L-Theanine products do not list caffeine.
Keep reading
This article is general information only and is not medical advice. Always read the label and follow the directions for use. Dietary supplements should not replace a balanced diet. If you are pregnant, breastfeeding, taking medication or have a medical condition, speak with your doctor or pharmacist before taking a new supplement.
