L-Theanine
by Pure Encapsulations · capsule · 120 capsules
- On the market (NIH)
- UPC 7 66298 00541 6
- DSLD label 295522
- Serving 2 capsules
- 60 servings
L-Theanine by Pure Encapsulations lists one ingredient: 400 mg of L-theanine per serving of 2 capsules. Its current label entered the NIH Dietary Supplement Label Database on August 23, 2023.
What is in L-Theanine?
Each row as the label prints it, per serving of 2 capsules. 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 | 400 mg | Higher than 97% of 1,602 products listing theanine (median 100 mg). Per day at the most servings: 1,200 mg. |
Source: NIH ODS Dietary Supplement Label Database, label 295522 (entered August 23, 2023), 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?
The rows in the top or bottom tenth of the products that list the same ingredient, and any above the adult upper limit at the most servings a day the directions give:
- Its 400 mg of L-theanine (filed by NIH under theanine) is higher than 97% of the 1,602 theanine products that print an amount; 18 list more.
The NIH database records 1 to 3 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-TheanineOL Olympian Labs · off the market same ingredients
- L-Theanine 400 mgOL Olympian Labs same ingredients
- L-Theanine 400 mgMental Refreshment same ingredients
- L-TheanineXYMOGEN same ingredients
- L-Theanine 200 mgWoodstock Vitamins same ingredients
- Suntheanine 400 mgSuperSmart 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
- Recommendations: As a dietary supplement, take 2 capsules, 1-3 times daily, between meals.
- Warnings
- Warning: If you are pregnant or lactating, have any health condition or are taking any medication, consult your health professional before use.
- Keep out of the reach of children.
- Use only if safety seal is intact.
- Allergens and what it does not contain
- Certified gluten-free by the Gluten-Free Certification Organization, www.gluten.org
- Gluten-free, Non-GMO & hypoallergenic
- Storage
- Store in a cool, dry place.
Source: label statements in DSLD label 295522.
What else is on the label?
Other ingredients: Cellulose, Water, Plant Fiber.
Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): GFCO.org (Gluten-Free Certification Organization). Listed with: Certified gluten-free (GFCO) (a seal is the label's claim; the certifier's own list confirms it).
How many labels does L-Theanine have?
8 labels are on file under this name since January 7, 2019: other sizes, label designs and reformulations. The current one leads this page.
- Label 295522 (current) Entered August 23, 2023 · on the market · 120 capsules · UPC 7 66298 00541 6
- Label 293999 Entered June 22, 2023 · off the market July 21, 2022 · 60 capsules · UPC 7 66298 00542 3
- Label 287430 Entered June 22, 2023 · on the market · 120 capsules · UPC 7 66298 00541 6
- Label 287429 Entered June 22, 2023 · on the market · 60 capsules · UPC 7 66298 00542 3
- Label 219400 Entered May 22, 2020 · off the market December 4, 2018 · 60 capsules · UPC 7 66298 00542 3
- Label 184855 Entered February 25, 2019 · off the market December 9, 2022 · 60 capsules · UPC 7 66298 00542 3
- Label 184851 Entered January 7, 2019 · off the market December 9, 2022 · 120 capsules · UPC 7 66298 00541 6
- Label 184585 Entered January 7, 2019 · off the market January 23, 2018 · 120 capsules · UPC 7 66298 00541 6
Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).
Who makes it?
The label names Pure Encapsulations (manufacturer), Sudbury, MA. All Pure Encapsulations products.