ATTENTION TRAIL / SHOP / L-THEANINE

L-Theanine

A single-ingredient supplement, on its own page so you can review the details without distraction.

US & CANADA · SHOP THROUGH AMAZON

As an Amazon Associate I earn from qualifying purchases. This page links to Amazon US — check the current seller, price, and availability there.

THE PRODUCT

One supplement for calmer, steadier focus.

The amino acid behind tea's calm — presented plainly, with no personalization deciding what you see.

L-THEANINE · SINGLE INGREDIENT

Nutricost L-Theanine

200 mg per serving · 240 capsules. The product label lists 200 mg of L-theanine per serving, with 240 capsules in the bottle.

Check price on Amazon↗

Amazon handles the order. Attention Trail does not take payments or receive your order information.

Product information is not medical advice, and not evidence that a product treats ADHD or improves attention. Talk with a qualified health professional about whether a supplement is suitable for you.

WATCH

Six years of experience.

One person's long-term experience with L-theanine for focus and brain health — not medical advice.

REVIEWS

What buyers say.

Rated 4.8 out of 5 from 1,605 reviews on Vitacost (originally posted on iHerb) — excerpts shown here so you don't have to leave this page.

★★★★★

The best

"Gives me smoother days — my mind feels more relaxed and calm."

iHerb Customer · via Vitacost · Jun 30, 2026

★★★★☆

i like it

"Pairs very well with caffeine — calm and focused."

iHerb Customer · via Vitacost · Jun 30, 2026

★★★★★

Helps to reduce my stress

"Perfect for managing anxiety — good overall quality."

iHerb Customer · via Vitacost · Jun 29, 2026

★★★★★

Good for Rest and Sleep

"More restful sleep — I wake up refreshed."

iHerb Customer · via Vitacost · Jun 29, 2026

★★★★★

Best theanine product

"Best value for money."

iHerb Customer · via Vitacost · Jun 29, 2026

★★★★★

Perfect

"Feel calmer and more focused, without sleepiness."

iHerb Customer · via Vitacost · Jun 29, 2026

Reviews are other shoppers' personal experiences, not medical advice. Individual results vary.

BEFORE YOU BUY

Check the label first.

Match the product. Confirm the brand, strength (200 mg), and count (240 capsules) on the Amazon listing before ordering.
Read the Supplement Facts panel. Check the serving size, other ingredients, and allergen notes.
Watch for overlap. If you take other supplements, look for duplicate ingredients across products.
Consider interactions. Supplements can interact with medicines, procedures, or health conditions — check with a doctor or pharmacist.

More detail: Supplement Safety Checklist · How to read a supplement label

SAFETY NOTES

Good to know.

"Natural" does not mean risk-free, and the FDA does not pre-approve supplements for safety or effectiveness — treat disease claims (for example, "treats ADHD") skeptically.
Do not stop or replace prescribed medication with a supplement without talking to your clinician.
If you notice an unexpected reaction, stop use and seek medical advice.

← Back to the shop