NEW
🍵 L-Theanine
Horbäach L Theanine | 200mg | 400 Capsules | Value Size
Cost per serving
$0.05
400 servings · ~400-day supply
$19.99last seen · confirm on Amazon.com
Horbäach · Amazon.com 0
See the offer Best L-Theanine for sleep
L-theanine is not a sedative — people take it in the evening to quiet a busy mind before bed. Below, the l-theanine products people use ranked by real cost per dose (to the commonly-studied 200 mg dose). A value comparison, not medical advice.
Updated September 2026
What the evidence actually shows
Limited — a handful of small, short trials report better self-rated sleep quality at around 200–450 mg a day, through relaxation rather than sedation. It will not knock you out.
Commonly used: ~200 mg in the evening.
How this list is built: these are l-theanine products ranked by real cost per dose across our whole l-theanine catalogue — not filtered or re-ordered by sleep. We don’t hold per-product evidence for a specific use, so we don’t pretend to rank for one. Products whose own label says they are for something else are left out.
The dose, the studies and what to watch for, in full: L-theanine: what it actually does, the dose, and the caffeine combo.
Ranked by cost per dose
NEW
🍵 L-Theanine
Nutricost Caffeine with L-Theanine
Cost per serving
$0.06
240 servings · ~240-day supply
$13.95Price from Amazon.com
Nutricost · Amazon.com 0
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🍵 L-Theanine
Nature's Trove L-Theanine 200mg Super Value Size…
Cost per serving
$0.07
365 servings · ~365-day supply
$27.15last seen · confirm on Amazon.com
Nature's Trove · Amazon.com 0
See the offer NEW
🍵 L-Theanine
Carlyle L-Theanine 200mg Supplement | 120 Capsules | Non-GMO
Cost per serving
$0.07
120 servings · ~120-day supply
$8.99Price from Amazon.com
Carlyle · Amazon.com 0
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🍵 L-Theanine
Nature's Trove L-Theanine 200mg 120 Vegetarian Capsules
Cost per serving
$0.08
120 servings · ~120-day supply
$9.98Price from Amazon.com
Nature's Trove · Amazon.com 0
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☕ Caffeine
Vitamatic L-Theanine 200 mg with Caffeine 100 mg, 120 Tablets
Cost per serving
$0.08
120 servings · ~120-day supply
$9.99Price from Amazon.com
Vitamatic · Amazon.com 0
See the offer NEW
🌙 5-HTP
Deal Supplement 5-HTP 200mg Per Serving
Cost per serving
$0.08
240 servings · ~240-day supply
$19.99Price from Amazon.com
DEAL SUPPLEMENT · Amazon.com 0
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🌙 5-HTP
5-HTP 200mg with GABA, L-Theanine and Vitamin B6, 240 Softgels
Cost per serving
$0.10
240 servings · ~240-day supply
$23.99Price from Amazon.com
Micro Ingredients · Amazon.com 0
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😌 GABA
Vitamatic Kava Kava 1000mg with Magnesium
Cost per serving
$0.14
120 servings · ~120-day supply
$16.99Price from Amazon.com
Vitamatic · Amazon.com 0
See the offer See the full ranking, benchmarks and lab-tested brands on best l-theanine by cost per dose.
Frequently asked
Does l-theanine help with sleep?+
Limited — a handful of small, short trials report better self-rated sleep quality at around 200–450 mg a day, through relaxation rather than sedation. It will not knock you out. This page ranks the products people take by real cost per dose; it does not claim a supplement treats or cures anything. Not medical advice — talk to a clinician about sleep.
Which l-theanine is cheapest for sleep?+
As of September 2026, the best value we track is Horbäach L Theanine | 200mg | 400 Capsules | Value Size. The full ranking by cost per dose is above; Price ÷ servings ÷ dose — the number retailers rarely divide out.
How much l-theanine for sleep?+
Commonly ~200 mg in the evening. This is a general reference, not a prescription — confirm the right amount for you with a clinician. Not medical advice.