PlainVitamins

L-Leucine

by NutraBio · powder · 17.64 ounces

  • On the market (NIH)
  • UPC 6 49908 23270 2
  • DSLD label 318080
  • Serving 3 g (1 scoop)
  • 166 servings

L-Leucine by NutraBio lists one ingredient: 3,000 mg of L-leucine, fermented per serving of 3 g. Its current label entered the NIH Dietary Supplement Label Database on September 25, 2024.

What is in L-Leucine?

Each row as the label prints it, per serving of 3 g. 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-Leucine: Supplement Facts rows against the market (DSLD label 318080, January 2026 release)
IngredientAmount% DVAmong products listing it
L-Leucine, Fermented(HPLC) (naturally fermented/vegan)3,000 mgLeucine in L-Leucine against 2,056 products3 g per serving; the middle half of products list 1 g to 3.5 g, the median 2.5 g.3 g

Higher than 60% of 2,056 products listing leucine (median 2.5 g). Per day at the most servings: 6 g.

Source: NIH ODS Dietary Supplement Label Database, label 318080 (entered September 25, 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?

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.

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: Add 1 scoop (3 grams) to your favorite beverage 1-2 times daily, or as directed by a physician. Mix for 15 to 20 seconds using a shaker cup or mix thoroughly with a spoon. May not mix very easily.
Warnings
Warning: Warning: Keep out of reach of children. Not for use by individuals under the age of 18 years.
Do not use if pregnant or nursing. Consult a physician before use if you have a medical condition or are taking any medication.
Discontinue use two weeks prior to surgery.
Processed in a facility and /or manufacturing line that also produces milk, tree nuts, nuts and soy.
Allergens and what it does not contain
Check. Verify. Trust. View independent lab results checkmysupps.com No proprietary blends Fully transparent
No added color, flavor, sweetener, or preservatives. Manufactured without lactose or gluten.
Storage
This product is sold by weight not volume. Some settling of contents may have occurred. Serving scoop included. Store in a cool dry place.

Source: label statements in DSLD label 318080.

What else is on the label?

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Check. Verify. Trust. View independent lab results checkmysupps.com No proprietary blends Fully transparent Manufactured in our GMP & FDA inspected facility Made in USA with ingredients sourced worldwide; OU (Kosher).

How many labels does L-Leucine have?

4 labels are on file under this name since November 21, 2020: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 318080 (current) Entered September 25, 2024 · on the market · 17.64 ounces · UPC 6 49908 23270 2
  2. Label 309338 Entered May 23, 2024 · on the market · 180 capsules · UPC 6 49908 23274 0
  3. Label 248235 Entered April 22, 2021 · on the market · 1.1 pounds · UPC 6 49908 23270 2
  4. Label 239044 Entered November 21, 2020 · off the market March 24, 2021 · 1.1 lbs · UPC 6 49908 23270 2

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

Who makes it?

The label names NutraBio Labs, Inc. (manufacturer), Middlesex, NJ. All NutraBio products.

Where next?