L-Theanine
by SuperiorLabs · capsule · 90 vegetable capsules
- On the market (NIH)
- UPC 8 50569 00619 3
- DSLD label 338185
- Serving 1 capsule
- 90 servings
L-Theanine by SuperiorLabs lists one ingredient: 250 mg of L-theanine per serving of 1 capsule. Its current label entered the NIH Dietary Supplement Label Database on September 25, 2025.
What is in L-Theanine?
Each row as the label prints it, per serving of 1 capsule. The capsule beside an amount places it among every product in the NIH database that lists the same ingredient: the bar is the middle half of their amounts, the line in it the median, the whiskers the 10th and 90th percentiles; the green tick is the FDA Daily Value and the red dashed tick the adult upper limit (IOM).
| Ingredient | Amount | % DV | Among products listing it |
|---|---|---|---|
| L-Theanine | 250 mg | Higher than 90% of 1,602 products listing theanine (median 100 mg). Per day at the most servings: 500 mg. |
Source: NIH ODS Dietary Supplement Label Database, label 338185 (entered September 25, 2025), version 9.4.0. See the label on DSLD or its label image (PDF). Amounts are what the maker printed; DSLD does not test products. Daily Values: the FDA's Daily Value page.
Is that a lot?
Every amount on this label with a position sits within the middle 80% of the products that list the same ingredient.
The NIH database records 1 to 2 servings a day from the label's directions; its % Daily Values are for adults and children 4 or more years of age. The directions as printed are further down this page.
The Tolerable Upper Intake Level is the most of a nutrient per day, from food, water and supplements together, that is likely to pose no risk for almost all adults (Institute of Medicine, 2011). It does not apply under medical supervision. This page compares labels; it is not medical advice.
Sources: amounts from the DSLD label; Daily Values from 21 CFR 101.9(c)(8)(iv); adult upper limits from the Institute of Medicine's DRI summary tables (2011). How positions are computed.
Which products have the closest formulas?
6 products list the very same ingredients; the nearest amounts come first.
- L-TheaninePureBulk.com same ingredients
- Suntheanine L-Theanine 125 mgNatural Factors Stress-Relax same ingredients
- Pure L-TheanineMicro Ingredients same ingredients
- L-Theanine 250 mgKirkman same ingredients
- Zen TheanineAOR Advanced Orthomolecular Research Premium same ingredients
- L-TheanineNOW same ingredients
Source: ingredient lists of every product's current label in DSLD (version 9.4.0); similarity weights each shared ingredient by how rare it is.
What does the label say about taking it?
Quoted from the label as DSLD transcribed it: the maker's words, including any claim about what the product does, which the FDA has not evaluated and PlainVitamins does not endorse.
- Directions
- Suggested Use: As a dietary supplement, adults take 1 capsule one to two times daily, or as directed by your health care practitioner. Best when taken with a meal.
- Warnings
- Caution: Do not exceed recommended dosage.
- Please consult a physician before consuming this product if you are pregnant or nursing, taking medication or have a medical condition.
- Not intended for use by individuals under the age of 18. Keep out of reach of children.
- Do not use if safety seal is damaged or missing.
- Allergens and what it does not contain
- Metal Safe Heavy Metal Tested
- Does not contain: magnesium stearate, dioxides or any potentially harmful ingredients of any kind.
- Storage
- Store in a cool, dry place.
Source: label statements in DSLD label 338185.
What else is on the label?
Other ingredients: Cellulose, Rice Concentrate.
Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Metal Safe Heavy Metal Tested GMP Compliant Facility Manufactured in the USA with globally sourced ingredients.
How many labels does L-Theanine have?
3 labels are on file under this name since June 23, 2017: other sizes, label designs and reformulations. The current one leads this page.
- Label 338185 (current) Entered September 25, 2025 · on the market · 90 vegetable capsules · UPC 8 50569 00619 3
- Label 227910 Entered June 24, 2020 · on the market · 90 vegetable capsules · UPC 8 50569 00619 3
- Label 74458 Entered June 23, 2017 · off the market March 5, 2020 · 90 vegetable capsules · UPC 8 50569 00619 3
Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).
Who makes it?
The label names Superior Labs, LLC. (distributor), Park City, UT. All SuperiorLabs products.