L-Theanine
by SuperSmart · capsule · 60 vegetarian capsules
- On the market (NIH)
- UPC 5 453003 822660
- DSLD label 332750
- Serving 2 to 4 capsules; amounts per 4 capsules
- 15 servings
L-Theanine by SuperSmart lists 2 ingredients, 2 with an amount per serving of 4 capsules, such as 1,000 mg of green tea extract. Its current label entered the NIH Dietary Supplement Label Database on June 25, 2025.
What is in L-Theanine?
Each row as the label prints it, per serving of 4 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 |
|---|---|---|---|
| Green Tea extract | 1,000 mg | Higher than 96% of 2,595 products listing green tea (median 100 mg). | |
| L-Theaninestandardized to 40% L-theanine, of which | 400 mg | Higher than 97% of 1,602 products listing theanine (median 100 mg). |
Source: NIH ODS Dietary Supplement Label Database, label 332750 (entered June 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?
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 1,000 mg of green tea is higher than 96% of the 2,595 green tea products that print an amount; 53 list more.
- 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 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?
4 products list the very same ingredients; the nearest amounts come first.
- L-Theanine 100 mg SuntheanineNOW · off the market same ingredients
- L-Theanine 100 mgNOW same ingredients
- Theanine 100 mg + Green TeaNatural Grocers by Vitamin Cottage · off the market same ingredients
- L-Theanine With Green Tea 200 mgSolaray same ingredients
- Immune CareNature Made 2 shared, 81% alike
- Day StarterSource Naturals 2 shared, 80% alike
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
- Directions: Adults. Take 2 to 4 vegetarian capsules a day.
- Warnings
- Precautions: Contains caffeine (50 mg per daily dose).
- Not recommended for children and pregnant women.
- Do not exceed the recommended daily dose. This product is a nutritional supplement and should not replace a varied, balanced diet.
- Keep out of children's reach.
- As with any nutritional supplement, you should consult a health professional before taking this product if you are pregnant, breastfeeding or have a health problem.
Source: label statements in DSLD label 332750.
What else is on the label?
Other ingredients: Acacia Gum.
How many labels does L-Theanine have?
One label is on file, entered on June 25, 2025.
- Label 332750 (current) Entered June 25, 2025 · on the market · 60 vegetarian capsules · UPC 5 453003 822660
DSLD also links this label to: Suntheanine 400 mg (image difference, same product), Suntheanine 400 mg (image difference, same product).
Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).
Who makes it?
The label names SN Worldwide Unipessoal, Lda (distributor), Funchal, Portugal. All SuperSmart products.