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SUPPLEMENTS·NOW FOODS
NOW Foods L-Theanine 200mg (120ct)
4.7 · 12,840 shopper ratings
Editor score8.4/10
Best for: Single-ingredient theanine at the lowest cost per capsule
Lowest price we found↓ $1.20 vs list
$15.79$16.99 list
At Amazon (as of – Details)
Buy at Amazon · $15.79 ↗Review updated 2026-07-01
Dose per capsule
200mg L-theanine
Form
Veg capsule
Count
120 veg capsules
The best-value pure L-theanine — 200mg per capsule, GMP-certified, and $15.79 for 120 servings.
L-theanine is an amino acid found in tea leaves. NOW Foods sells it as a single-ingredient capsule at 200mg, GMP-certified, 120 vegan capsules for $15.79 — about 13¢ a capsule against Sports Research's 30¢.
Price & where to buy
Prices checked 2026-10-09amazon
AmazonBest price✓ Fast delivery · easy returns
GMP-certified · vegan · 120 servings
$15.79
(as of – Details)
Walmart
Walmart
Availability + price vary by store
Price varies
Not price-checked
Target
Target
Availability + price vary by store
Price varies
Not price-checked
Prices shown were last checked on 2026-10-09 and can change at any time — the price on the retailer's site at checkout is the one that applies. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product. 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 price at our recommended retailer as at our last check of that offer (2026-10-09) and the manufacturer's list price for comparison. Amazon prices come from Amazon's own product data service and are refreshed twice a day; each one shows the date and time Amazon gave it, and one older than 24 hours is replaced by “Check price”. Other retailers' prices are checked by hand and show the date of that check. Retail prices move constantly, so the price on the retailer's own page at checkout is the one that applies. More on Amazon prices
Should you buy it?
What we like
- Cheapest per capsule of the theanine products here
- Single ingredient — nothing else in the capsule
- Trusted 50-year manufacturer, GMP-certified
- Vegan, non-GMO, gluten-free
What to know before buying
- Listed certification stops at GMP — that covers how it's made, not a test of what ends up in the bottle
- No branded form named on the listing
At a glance
Dose per capsule200mg L-theanine
FormVeg capsule
Count120 veg capsules
Cost per serving~14¢
ManufacturingGMP-certified
Non-GMOYes
VeganYes
Gluten-freeYes
Best forLowest cost per capsule
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 — 240 tablets at a low price per tablet.
→ USP-verification shoppers, value buyers
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 — 240 tablets from Doctor's Best.
→ Value-focused buyers, athletes
Decision support · what no other comparison site has
Take the quiz · 60 secNot sure which one is right for you?
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Frequently asked questions
Does L-theanine make you sleepy?
See /natural-sleep-remedies for what the trial evidence actually shows.
How much L-theanine for sleep?
We don't publish dosing guidance — ask a pharmacist or your doctor.
NOW vs Suntheanine — which is better?
Suntheanine is a branded L-theanine made by Taiyo. This listing doesn't name a branded form, so check the ingredient line on the bottle if that matters to you. NOW is the cheaper of the two.
Can I take L-theanine every day?
We don't publish dosing guidance — ask a pharmacist or your doctor.
Affiliate disclosure: SleepyHero earns a small commission when you buy through these links. It doesn't cost you extra. Reviews and rankings are editorial — we don't accept payment for placement.