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Moderate Evidence🧘

Best L-Theanine for Stress & Anxiety in Australia

Amino acid found in tea that promotes relaxation without drowsiness. Compare prices across Australian retailers and find the best value.

Full L-Theanine profile — evidence, interactions & all conditions

Quick Summary

Dosage

200-400 mg/day

Time to Effect

30 minutes - 2 weeks

From

$0.15/serve

Evidence

moderate (4/5)

Timing: Take as needed or daily

Clinical Evidence

L-theanine reduces stress and cortisol response: a randomised trial

rct2019n=34

RCT found 200mg L-theanine significantly reduced salivary cortisol and subjective stress responses to an acute stressor compared to placebo, with effects within 1 hour of ingestion.

How Does L-Theanine Help with Stress & Anxiety?

L-Theanine increases alpha brain wave activity and boosts GABA, serotonin, and dopamine levels, promoting calm focus.

Can be taken as needed for acute stress. Works within 30-60 minutes.

This link is supported by 1 clinical study, with the evidence rated as moderate overall. With an effectiveness rating of 4/5, L-Theanine is one of the top-rated supplements for stress & anxiety.

Best Prices in Australia

L-Theanine 200 mg, 120 Veg Capsules

NOW FoodsviaiHerb

200 mg per serve · 120 serves · capsule

$0.15/serve

$17.99 total

Buy
2

Thorne Theanine 200mg 90 Caps

ThorneviaiHerb

200 mg per serve · 90 serves · capsule

$0.47/serve

$42.00 total

Buy
3

PharmaGABA-250, 60 Capsules

ThorneviaThorne

250mg per serve · 60 serves · capsule

$0.92/serve

$54.99 total

Buy

Interactions to Watch

  • Blood pressure medicationsminor— L-Theanine may have mild blood pressure lowering effects, potentially enhancing antihypertensive medications.
Check all interactions

Other Supplements for Stress & Anxiety

Ashwagandha

strong evidence

Magnesium

moderate evidence

Rhodiola Rosea

moderate evidence

NAC (N-Acetyl Cysteine)

moderate evidence

View complete Stress & Anxiety supplement guide

L-Theanine for Other Goals

L-Theanine for Sleep(moderate)L-Theanine for Focus & Memory(moderate)

Frequently Asked Questions

How much L-Theanine should I take for stress & anxiety?
The recommended dose of L-Theanine for stress & anxiety is 200-400 mg per day. Can be taken as needed for acute stress. Works within 30-60 minutes. Always consult a healthcare professional before starting supplementation.
When is the best time to take L-Theanine for stress & anxiety?
Take as needed or daily. Consistency matters more than exact timing — take it at the same time each day for best results.
How long does L-Theanine take to work for stress & anxiety?
Most people notice effects within 30 minutes - 2 weeks. Individual results vary depending on baseline levels, dosage, and overall health. Consistent daily use is important — don't expect overnight results.
What form of L-Theanine is best for stress & anxiety?
L-Theanine is available as capsule, tablet, powder. Powder forms often offer the best value per serve and can be mixed into drinks.
Where can I buy L-Theanine for stress & anxiety in Australia?
You can buy L-Theanine from iHerb, Thorne in Australia. The best value we found is L-Theanine 200 mg, 120 Veg Capsules at $0.15 per serve from iHerb.
Is L-Theanine safe? Are there any interactions?
L-Theanine is generally considered safe at recommended doses. However, it can interact with Blood pressure medications. Always check with your doctor if you take medications, especially before combining supplements.

Get a Full Stress & Anxiety Stack

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This information is for educational purposes only and is not medical advice. Consult a healthcare professional before starting any supplement regimen. SuppUp earns affiliate commissions from qualifying purchases — this does not affect our recommendations.