NOW Foods L-Theanine 200mg (120ct)
Best for: Theanine at the lowest cost per capsule
The best-value 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 at 200mg per capsule with 100mg of inositol added, GMP-certified, 120 vegan capsules for $15.79 — about 13¢ a capsule against Sports Research's 30¢.
Price & where to buy
Prices checked 2026-10-29Prices shown were last checked on 2026-10-29 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 (2026-10-29) and, when Amazon reports one, its 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
- Short label: theanine plus inositol, no melatonin
- 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
Help for nights your mind won't switch off.
Two free printables now, then four short emails: one change to try tonight, how to choose, and what we'd skip.
Free. Five short emails over two weeks, then about one a month. Unsubscribe any time.
At a glance
Compare with alternatives
Quick verdicts for the supplements most often considered alongside the NOW Foods L-Theanine 200mg (120ct).
NOW Foods L-Theanine 200mg (120ct) vs Nature Made Melatonin 5mg (300ct)
The USP-verified melatonin — 300 tablets at a low price per tablet.
→ USP-verification shoppers, value buyers
Nature Made Melatonin 5mg (300ct) review →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
Doctor's Best High Absorption Magnesium Glycinate 200mg (240ct) review →Not sure which one is right for you?
Our 60-second sleep score quiz asks 8 questions and recommends the right sleep gear for your goals. Free, no signup.
More supplements we compared
See all →
Thorne Magnesium Bisglycinate Powder (60 servings)
Thorne Glycine (250 capsules, 1 g per serving)
Life Extension Melatonin 6 Hour Timed Release 300 mcg (100ct)
Life Extension Neuro-Mag Magnesium L-Threonate
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.