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L-theanine in Australia: evidence and prices
TL;DR
L-theanine is an amino acid found in tea. A 2025 systematic review and meta-analysis looked at L-theanine and sleep outcomes. Evidence is still limited. Ask your pharmacist if you take medicines for sleep, mood or blood pressure.
What the research says
A 2025 systematic review and meta-analysis examined L-theanine consumption and sleep outcomes. [1]
Prices in Australia
Coles online, listed shelf price checked 15 Oct 2026 (search results; specials marked). Prices change often. This is not an endorsement or a recommendation, and no affiliate links are used. Chemist Warehouse, Priceline and iHerb: price check pending.
| Product (as listed) | Price |
|---|---|
| Vitaceuticals Advanced L-theanine (30 pack) | A$13.50 (special; was A$27.00) |
| Nature's Way Magnesium + L-theanine (40 pack) | A$20.00 (special; was A$40.00) |
FAQ
Can I take L-theanine with magnesium?
Many products combine them. Total your labels and ask your pharmacist.
Sources
Sources checked 15 Oct 2026. Pending human review before publication.