Skip to content
S
SuppUp
Stack
LibraryInteractions
Sign in
Moderate Evidence😴

Best L-Theanine for Sleep 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

1-2 weeks

From

$0.15/serve

Evidence

moderate (4/5)

Timing: Take 30-60 minutes before bed

Clinical Evidence

L-theanine supplementation and sleep quality: a systematic review

systematic_review2020n=394

Systematic review of 9 studies found 200-400mg L-theanine improved sleep quality, reduced sleep latency, and enhanced next-day alertness without sedation in adults with stress-related sleep issues.

Effects of L-Theanine on Stress and Sleep Quality

PMID: 31758301
Randomised controlled trial2019n=30

L-theanine (200mg daily) significantly decreased sleep latency, reduced sleep disturbance scores, and increased sleep quality compared to placebo in adults with generalised anxiety.

How Does L-Theanine Help with Sleep?

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

Works well combined with magnesium. Promotes relaxation without sedation.

This link is supported by 2 clinical studies, with the evidence rated as moderate overall. With an effectiveness rating of 4/5, L-Theanine is one of the top-rated supplements for sleep.

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 Sleep

Magnesium

strong evidence

Melatonin

strong evidence

Valerian Root

moderate evidence

Glycine

moderate evidence

View complete Sleep supplement guide

L-Theanine for Other Goals

L-Theanine for Stress & Anxiety(moderate)L-Theanine for Focus & Memory(moderate)

Frequently Asked Questions

How much L-Theanine should I take for sleep?
The recommended dose of L-Theanine for sleep is 200-400 mg per day. Works well combined with magnesium. Promotes relaxation without sedation. Always consult a healthcare professional before starting supplementation.
When is the best time to take L-Theanine for sleep?
Take 30-60 minutes before bed. 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 sleep?
Most people notice effects within 1-2 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 sleep?
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 sleep 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 Sleep Stack

L-Theanine is just one piece. Our AI builds a complete supplement stack tailored to your sleep goals, with dosages and prices.

Get My Sleep Stack

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.