Life Extension L-Theanine is a single ingredient supplement. L-theanine is an amino acid found almost only in tea leaves. A cup of green tea has roughly 10 to 25 mg. Check the label for the amount per capsule and the serve size.
At a glance
| Detail | L-Theanine |
|---|---|
| Ingredient | L-theanine |
| Natural source | Tea leaves |
| Directions | Follow the label |
What to know
L-theanine has been studied in small trials for relaxation and for attention when combined with caffeine. Typical study doses are 100 to 200 mg. It does not usually cause drowsiness, which is why some people pair it with their morning coffee. The research is modest, and it is not a treatment for anxiety or sleep problems.
Who should check first
- Blood pressure medicine: L-theanine may lower blood pressure slightly. Check with your doctor.
- Sedatives or stimulant medicine: check with your pharmacist.
- Pregnant or breastfeeding: check with your doctor first.
How to use and where to buy
Follow the directions on the label. Shop Life Extension L-Theanine online at Supps247 with Australia-wide delivery or click and collect, or browse more from Life Extension.
Checked against the product listing on 12 November 2026. Always read the label and follow the directions. General information, not medical advice.
