L-Leucine 500 mg
by Source Naturals · capsule · 120 capsules
- On the market (NIH)
- UPC 0 21078 02053 0
- DSLD label 295941
- Serving 2 to 3 capsules; amounts per 3 capsules
- 40 servings
L-Leucine 500 mg by Source Naturals lists one ingredient: 1.5 g of L-leucine per serving of 3 capsules. Its current label entered the NIH Dietary Supplement Label Database on August 23, 2023.
What is in L-Leucine 500 mg?
Each row as the label prints it, per serving of 3 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 |
|---|---|---|---|
| Calories | 5 Calories | ||
| L-Leucine | 1.5 g | 66% of 2,056 products listing leucine give more (median 2.5 g). |
Source: NIH ODS Dietary Supplement Label Database, label 295941 (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?
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.
- 100% Pure L- Leucine 1600 MilligramsNutraBio · off the market same ingredients
- 100% Pure L- Leucine 400 mgNutraBio · off the market same ingredients
- L- Leucine 400 mgNutraBio same ingredients
- L-LeucineEarthborn Elements same ingredients
- L-LeucineSource Naturals same ingredients
- Leucine PowderMoss Nutrition 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: 2 to 3 capsules daily between meals.
- Warnings
- Note: If you are pregnant, may become pregnant, or breastfeeding, consult your health care professional before using this product.
- Do not use if either tamper-evident seal is broken or missing.
- Keep out of the reach of children.
- Allergens and what it does not contain
- Contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, preservatives, or artificial color, flavor or fragrance.
Source: label statements in DSLD label 295941.
What else is on the label?
Other ingredients: Gelatin, Silica, Magnesium Stearate.
How many labels does L-Leucine 500 mg have?
3 labels are on file under this name since November 22, 2022: other sizes, label designs and reformulations. The current one leads this page.
- Label 295942 Entered September 25, 2023 · off the market July 6, 2022 · 240 capsules · UPC 0 21078 02054 7
- Label 295941 (current) Entered August 23, 2023 · on the market · 120 capsules · UPC 0 21078 02053 0
- Label 274771 Entered November 22, 2022 · on the market · 240 capsules · UPC 0 21078 02054 7
Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).
Who makes it?
The label names Source Naturals, Inc. (distributor), Santa Cruz, CA. All Source Naturals products.