PlainVitamins

Arginine & Ornithine 500 mg / 250 mg

by NOW Sports · capsule · 100 veg capsules

  • On the market (NIH)
  • UPC 7 33739 00040 8
  • DSLD label 335337
  • Serving 2 veg capsules
  • 50 servings

Arginine & Ornithine 500 mg / 250 mg by NOW Sports lists 3 ingredients, 3 with an amount per serving of 2 veg capsules, such as 1 g of L-arginine and 500 mg of L-ornithine. Its current label entered the NIH Dietary Supplement Label Database on July 24, 2025.

What is in Arginine & Ornithine 500 mg / 250 mg?

Each row as the label prints it, per serving of 2 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).

Arginine & Ornithine 500 mg / 250 mg: Supplement Facts rows against the market (DSLD label 335337, January 2026 release)
IngredientAmount% DVAmong products listing it
L-ArginineL-Arginine Note: (free form) (1,000 mg)1 gArginine in Arginine & Ornithine 500 mg / 250 mg against 1,455 products1,000 mg per serving; the middle half of products list 167 mg to 1,000 mg, the median 500 mg.1,000 mg

Higher than 64% of 1,455 products listing arginine (median 500 mg).

L-Ornithine500 mgOrnithine in Arginine & Ornithine 500 mg / 250 mg against 258 products500 mg per serving; the middle half of products list 100 mg to 900 mg, the median 400 mg.500 mg

Higher than 57% of 258 products listing ornithine (median 400 mg).

L-Ornithine Hydrochloride644 mg

Source: NIH ODS Dietary Supplement Label Database, label 335337 (entered July 24, 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?

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.

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 2 capsules daily as needed, preferably with juice or water on an empty stomach, before exercise or at bedtime.
Warnings
Caution: For adults only. Keep out of reach of children.
Do not use if history of myocardial infarction or established coronary artery disease.
Consult physician if pregnant/nursing, taking medication, or have a medical condition (including herpes and/or glaucoma).
Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut or sesame ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.
Allergens and what it does not contain
Steroid tested Non-GMO
Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut or sesame ingredients.
Storage
Store in a cool, dry, dark place after opening.

Source: label statements in DSLD label 335337.

What else is on the label?

Other ingredients: Hypromellose, Stearic Acid.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Crescent H (Halal) GMP Quality Assured Informed Sport We Test - You Trust Steroid tested Triangle K (Kosher); Vegan. Listed with: Informed Sport or Informed Choice (a seal is the label's claim; the certifier's own list confirms it).

How many labels does Arginine & Ornithine 500 mg / 250 mg have?

6 labels are on file under this name since December 22, 2019: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 335337 (current) Entered July 24, 2025 · on the market · 100 veg capsules · UPC 7 33739 00040 8
  2. Label 314241 Entered July 25, 2024 · off the market January 21, 2025 · 100 veg capsules · UPC 7 33739 00040 8
  3. Label 314242 Entered June 20, 2024 · on the market · 250 veg capsules · UPC 7 33739 00042 2
  4. Label 244476 Entered February 25, 2021 · off the market February 12, 2024 · 250 capsules
  5. Label 210318 Entered December 22, 2019 · off the market August 3, 2023 · 250 capsules · UPC 7 33739 00042 2
  6. Label 210317 Entered December 22, 2019 · off the market February 12, 2024 · 100 capsules · UPC 7 33739 00040 8

DSLD also links this label to: Arginine & Ornithine 500/250 (image difference, same product), Arginine & Ornithine 500/250 (package size difference, same product), Arginine & Ornithine 500/250 (package size difference, same product), Arginine & Ornithine 500/250 (image difference, same product), Arginine & Ornithine 500/250 (package size difference, same product), Arginine & Ornithine 500/250 (package size 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 NOW FOODS (manufacturer), Bloomingdale, IL. All NOW Sports products.

Where next?