L-Theanine 250 mg
by Kirkman · capsule · 100 capsules
- On the market (NIH)
- UPC 8 12325 02214 4
- DSLD label 297055
- Serving 1 to 2 capsules; amounts per 1 capsule
- 100 servings
L-Theanine 250 mg by Kirkman 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, 2023.
What is in L-Theanine 250 mg?
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). |
Source: NIH ODS Dietary Supplement Label Database, label 297055 (entered September 25, 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?
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 one serving 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-TheanineSuperiorLabs 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: Take one to two capsules daily or as directed by a physician.
- Warnings
- Keep out of the reach of children.
- Allergens and what it does not contain
- Free of: Milk, Eggs, Fish, Shellfish, Tree Nuts, Peanuts, Wheat or Soy
- Gluten-Free
- Storage
- Important: Store in a cool dry place and tightly capped.
Source: label statements in DSLD label 297055.
What else is on the label?
Other ingredients: Microcrystalline Cellulose, Hypromellose, Water, Magnesium Stearate.
Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Ultra Tested cGMP Certified.
How many labels does L-Theanine 250 mg have?
One label is on file, entered on September 25, 2023.
- Label 297055 (current) Entered September 25, 2023 · on the market · 100 capsules · UPC 8 12325 02214 4
Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).
Who makes it?
The label names Kirkman (manufacturer), Lake Oswego, OR. All Kirkman products.