PlainVitamins

L-Theanine (500 mg)

by BulkSupplements.com · capsule · 300 gelatin capsules

  • On the market (NIH)
  • UPC X000OD1FD5
  • DSLD label 312278
  • Serving 1 capsule
  • 300 servings

L-Theanine (500 mg) by BulkSupplements.com lists one ingredient: 500 mg of L-theanine per serving of 1 capsule. Its current label entered the NIH Dietary Supplement Label Database on May 23, 2024.

What is in L-Theanine (500 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).

L-Theanine (500 mg): Supplement Facts rows against the market (DSLD label 312278, January 2026 release)
IngredientAmount% DVAmong products listing it
L-Theanine500 mgTheanine in L-Theanine (500 mg) against 1,602 products500 mg per serving; the middle half of products list 90 mg to 200 mg, the median 100 mg.500 mg

Higher than over 99% of 1,602 products listing theanine (median 100 mg). Per day at the most servings: 1,000 mg.

Source: NIH ODS Dietary Supplement Label Database, label 312278 (entered May 23, 2024), 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 500 mg of L-theanine (filed by NIH under theanine) is higher than over 99% of the 1,602 theanine products that print an amount; 3 list more.

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.

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, take 1 capsule once or twice daily, or as directed by a physician.
Warnings
Always consult a physician before taking any dietary supplement.
Keep out of reach of children.
Allergens and what it does not contain
Free of: Added sugar, soy, dairy, yeast, gluten, additives
Storage
Store in a dry, cool place

Source: label statements in DSLD label 312278.

What else is on the label?

Other ingredients: Bovine Gelatin.

How many labels does L-Theanine (500 mg) have?

6 labels are on file under this name since August 23, 2021: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 312278 (current) Entered May 23, 2024 · on the market · 300 gelatin capsules · UPC X000OD1FD5
  2. Label 312277 Entered May 23, 2024 · on the market · 100 gelatin capsules · UPC X000OD1EHR
  3. Label 254810 Entered October 22, 2021 · on the market · 300 capsules · UPC X000OD1FD5
  4. Label 254772 Entered October 22, 2021 · on the market · 300 vegetarian capsules
  5. Label 254807 Entered September 24, 2021 · on the market · 100 capsules · UPC X000OD1EHR
  6. Label 252838 Entered August 23, 2021 · on the market · 100 vegetarian capsules

Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).

Who makes it?

The label names BulkSupplements.com (distributor), Henderson, NV. All BulkSupplements.com products.

Where next?