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 focus and calm
L-theanine, an amino acid from tea, is taken for calm, steady focus — often paired with caffeine to smooth out the jitters. 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
Evidence is modest — small studies suggest a subtle effect on relaxed attention, most consistently when combined with caffeine.
Commonly used: ~100–200 mg.
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 focus and calm. 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.
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
See the offer NEW
🍵 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
See the offer NEW
🍵 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
See the offer NEW
☕ 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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🍵 L-Theanine
NOW Foods Supplements, L-Theanine 200 mg with Inositol, Stress…
Cost per serving
$0.17
120 servings · ~120-day supply
$20.69Price from Amazon.com
NOW Foods · 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 focus and calm?+
Evidence is modest — small studies suggest a subtle effect on relaxed attention, most consistently when combined with caffeine. 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 focus and calm.
Which l-theanine is cheapest for focus and calm?+
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 focus and calm?+
Commonly ~100–200 mg. This is a general reference, not a prescription — confirm the right amount for you with a clinician. Not medical advice.