PlainVitamins

L-Ornithine 500 mg

by NOW · capsule · 120 veg capsules

  • On the market (NIH)
  • UPC 7 33739 00122 1
  • DSLD label 314452
  • Serving 3 veg capsules
  • 40 servings

L-Ornithine 500 mg by NOW lists 2 ingredients, 2 with an amount per serving of 3 veg capsules, such as 1,500 mg of L-ornithine. Its current label entered the NIH Dietary Supplement Label Database on June 20, 2024.

What is in L-Ornithine 500 mg?

Each row as the label prints it, per serving of 3 veg 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).

L-Ornithine 500 mg: Supplement Facts rows against the market (DSLD label 314452, January 2026 release)
IngredientAmount% DVAmong products listing it
L-Ornithineas L-Ornithine Hydrochloride1.5 g1,500 mgOrnithine in L-Ornithine 500 mg against 258 products1,500 mg per serving; the middle half of products list 100 mg to 900 mg, the median 400 mg.1,500 mg

Higher than 92% of 258 products listing ornithine (median 400 mg).

L-Ornithineas L-Ornithine Hydrochloride1,913 mg

Source: NIH ODS Dietary Supplement Label Database, label 314452 (entered June 20, 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 1,500 mg of L-ornithine (filed by NIH under ornithine) is higher than 92% of the 258 ornithine products that print an amount; 13 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?

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 Usage: Take 3 capsules daily with juice or water on an empty stomach.
Warnings
Not manufactured with yeast, wheat, gluten, soy, milk, egg, fish, shellfish, tree nut or sesame ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.
Caution: For adults only.
Consult physician if pregnant/nursing, taking medication, or have a medical condition.
Keep out of reach of children.
Allergens and what it does not contain
Non-GMO
Not manufactured with yeast, wheat, gluten, soy, milk, egg, fish, shellfish, tree nut or sesame ingredients.
Storage
Store in a cool, dry place after opening.

Source: label statements in DSLD label 314452.

What else is on the label?

Other ingredients: Hypromellose, Microcrystalline Cellulose, Stearic Acid.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): GMP Quality Assured; Triangle K (Kosher).

How many labels does L-Ornithine 500 mg have?

8 labels are on file under this name since October 1, 2012: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 314452 (current) Entered June 20, 2024 · on the market · 120 veg capsules · UPC 7 33739 00122 1
  2. Label 244400 Entered February 25, 2021 · on the market · 120 veg capsules · UPC 7 33739 00122 1
  3. Label 73550 Entered May 24, 2017 · off the market August 8, 2023 · 120 veg capsules · UPC 7 33739 00122 1
  4. Label 53383 Entered November 24, 2015 · on the market · 60 veg capsules · UPC 7 33739 00120 7
  5. Label 47673 Entered July 24, 2015 · off the market March 7, 2017 · 120 veg capsules · UPC 7 33739 00122 1
  6. Label 45704 Entered May 22, 2015 · off the market October 23, 2015 · 60 veg capsules · UPC 7 33739 00120 7
  7. Label 13477 Entered October 1, 2012 · off the market June 30, 2015 · 120 capsules · UPC 7 33739 00122 1
  8. Label 13476 Entered October 1, 2012 · off the market April 24, 2015 · 60 capsules · UPC 7 33739 00120 7

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

Who makes it?

The label names NOW Foods (manufacturer), Bloomingdale, IL. All NOW products.

Where next?