Quick answer
L-theanine is an amino acid found naturally in tea leaves (Camellia sinensis), especially green tea. It isn't one of the amino acids used to build proteins. As a supplement it's sold in Australia as capsules and gummies, commonly in 200mg or 400mg serves.
Type
A non-protein amino acid
Natural source
Tea leaves, especially green tea and matcha
First identified
Japan, 1949, from gyokuro tea
Common amounts
200mg or 400mg per serve
Formats
Capsules, gummies, drink powders
Where does L-theanine come from?
L-theanine occurs naturally in the leaves of the tea plant. Shade-grown teas such as gyokuro and matcha tend to contain more. Supplement-grade L-theanine is usually produced by fermentation so it's consistent from batch to batch.
How much L-theanine is in a cup of tea?
Estimates vary widely with the type of tea, how it's grown and how long it's brewed. A cup of green or black tea is often estimated to contain somewhere between about 5mg and 20mg. Supplements, at 200mg or 400mg per serve, are measured very differently. See L-Theanine in Tea vs Supplements.
Featured in this guide
MAYN L-Theanine 200mg, 120 capsules
120 capsules: a long-lasting pack.
L-theanine capsules vs gummies
| MAYN product | Per serve | Format | Pack |
|---|---|---|---|
| L-Theanine 200mg | 200mg | Capsule | 120 capsules |
| L-Theanine 400mg | 400mg | Capsule | 60 capsules |
| L-Theanine 400mg Gummies | 400mg | Gummy | 60 gummies |
Capsules are tasteless and free of added sugar. Gummies are flavoured and don't need water. Read more in L-Theanine 200mg vs 400mg vs Gummies.
Is L-theanine the same as theanine?
Yes, in practice. "Theanine" usually refers to L-theanine, the naturally occurring form found in tea. The "L" describes the orientation of the molecule.
Tip: Check whether a product lists "L-theanine" and the milligrams per serve, so you can compare like with like.
Frequently asked questions
Does L-theanine contain caffeine?
No. L-theanine is an amino acid, not caffeine. Tea contains both, but an L-theanine supplement does not contain caffeine unless caffeine is listed on the label.
Is L-theanine vegan?
L-theanine itself is usually made by fermentation and isn't animal-derived. Check the capsule shell or gummy ingredients, as some gummies use gelatin.
Can I buy L-theanine in Australia?
Yes. MAYN L-Theanine is available online in Australia in 200mg capsules, 400mg capsules and 400mg gummies.
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.
