1 / 5SUPPLEMENTS·NOW FOODS
NOW Foods L-Theanine 200mg (120ct)
4.7 · 12,840 reviews
Editor score8.4/10
Best for: Anxiety-driven insomnia, ruminating minds, stackers with melatonin
Dose per capsule
200mg L-theanine
Count
120 veg capsules
Cost per serving
~14¢
The best-value pure L-theanine — 200mg per capsule, GMP-certified, and $17 for 120 servings.
NOW Foods L-Theanine is the nootropic community's benchmark. 200mg per serving is the well-studied dose for calm-focus (from tea, without the caffeine). GMP-certified manufacturing. 120 vegan capsules at $17 = 14¢ per dose. Best supplement for anxiety-driven sleep issues where you can't turn your brain off at night. Stacks well with 3mg melatonin.
Price across 3 retailers
Prices checked 2026-07-01amazon
AmazonBest price✓ Fast delivery · easy returns
GMP-certified · vegan · 120 servings
$16.99
2026-07-01
Prices shown were last checked on 2026-07-01and can change at any time — the price on the retailer's site at checkout is the one that applies. As an Amazon Associate and affiliate we may earn a commission on purchases made through these links, at no extra cost to you.
How our prices work
We show the lowest price we found at our last check (2026-07-01) and the manufacturer's list price for comparison. Retail prices — Amazon's especially — move constantly, so treat these as a guide: the price shown on the retailer's own page at checkout is the one that applies. Tap through to see each retailer's current price.
Should you buy it?
What we like
- Calms the racing mind without sedation
- Stacks safely with magnesium
- Trusted 50-year manufacturer, GMP-certified
What to know before buying
- Subtle effect — don't expect a knockout
- Capsule count math beats the label claim
- Best paired, not solo, for real insomnia
At a glance
Dose per capsule200mg L-theanine
Count120 veg capsules
Cost per serving~14¢
ManufacturingGMP-certified
Non-GMOYes
VeganYes
Gluten-freeYes
Stack withMelatonin, magnesium glycinate
Onset30-45 min
Best forAnxiety-driven insomnia
How it scores
How our 8.4/10 breaks down — rated on the dimensions that matter most for supplements, from hands-on testing and verified specs, not the marketing.
Evidence
8/10
Dosing
8.5/10
Purity
8.5/10
Gentleness
9.5/10
Value
9/10
Compare with alternatives
Quick verdicts for the supplements most often considered alongside the NOW Foods L-Theanine 200mg (120ct).
VS·HEAD-TO-HEAD
NOW Foods L-Theanine 200mg (120ct) vs Nature Made Melatonin 5mg (240ct)
The USP-verified melatonin your GP would actually recommend — same dose as prescription-adjacent formulations at a third of the price.
→ Jet lag recovery, shift workers, occasional sleep onset issues
VS·HEAD-TO-HEAD
NOW Foods L-Theanine 200mg (120ct) vs Doctor's Best High Absorption Magnesium Glycinate 200mg (240ct)
The highest-rated magnesium on Amazon for sleep — glycinate form is chelated for maximum absorption without laxative effects.
→ Restless legs, muscle tension, anxiety-driven insomnia, athletes
Decision support · what no other comparison site has
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Frequently asked questions
Does L-theanine make you sleepy?
Not directly — L-theanine promotes calm alertness, not sedation. It reduces the racing-mind that keeps you awake without knocking you out. Best paired with melatonin for sleep-onset help.
How much L-theanine for sleep?
200-400mg per dose. NOW at 200mg is the standard sleep dose; double for stronger effect. Studies use 200-400mg with no reported side effects.
NOW vs Suntheanine — which is better?
Suntheanine is L-theanine sourced from Taiyo — the most researched form. NOW uses Suntheanine in their L-theanine products (check label). Practical difference is negligible; NOW is cheaper.
Can I take L-theanine every day?
Yes — no known long-term risks at 200-400mg/day. Unlike melatonin, no dependency or tolerance issues reported. Safe for daily use.
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