PlainVitamins

Arginine & Citrulline 500 mg / 250 mg

by NOW Sports · capsule · 240 veg capsules

  • On the market (NIH)
  • UPC 7 33739 00038 5
  • DSLD label 314239
  • Serving 1 veg capsule
  • 240 servings

Arginine & Citrulline 500 mg / 250 mg by NOW Sports lists 2 ingredients, 2 with an amount per serving of 1 veg capsule, such as 500 mg of L-arginine and 250 mg of L-citrulline. Its current label entered the NIH Dietary Supplement Label Database on July 25, 2024.

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

Each row as the label prints it, per serving of 1 veg 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).

Arginine & Citrulline 500 mg / 250 mg: Supplement Facts rows against the market (DSLD label 314239, January 2026 release)
IngredientAmount% DVAmong products listing it
L-ArginineL-Arginine Note: free form500 mgArginine in Arginine & Citrulline 500 mg / 250 mg against 1,455 products500 mg per serving; the middle half of products list 167 mg to 1,000 mg, the median 500 mg.500 mg

47% of 1,455 products listing arginine give more (median 500 mg). Per day at the most servings: 1,000 mg.

L-CitrullineL-Citrulline Note: free form250 mgCitrulline in Arginine & Citrulline 500 mg / 250 mg against 1,209 products0.25 g per serving; the middle half of products list 1 g to 5 g, the median 3 g.0.25 g

91% of 1,209 products listing citrulline give more (median 3 g). Per day at the most servings: 0.5 g.

Source: NIH ODS Dietary Supplement Label Database, label 314239 (entered July 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?

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:

  • 91% of the 1,209 products that print an amount of citrulline list more than its 0.25 g of L-citrulline (filed by NIH under citrulline) (median 3 g).

The NIH database records 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 usage: Take 1 capsule 2 times daily.
Warnings
Caution: For adults only. Keep out of reach of children.
Consult physician if pregnant/nursing, taking medication (especially antihypertensives, nitrates, or other heart medications), or have a medical condition (especially herpes, kidney impairment 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
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 314239.

What else is on the label?

Other ingredients: Hypromellose, Stearic Acid, Silicon Dioxide.

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 Triangle K (Kosher).

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

4 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 314239 (current) Entered July 25, 2024 · on the market · 240 veg capsules · UPC 7 33739 00038 5
  2. Label 314238 Entered July 25, 2024 · on the market · 120 veg capsules · UPC 7 33739 00037 8
  3. Label 210316 Entered December 22, 2019 · off the market February 12, 2024 · 240 veg capsules · UPC 7 33739 00038 5
  4. Label 210315 Entered December 22, 2019 · off the market February 12, 2024 · 120 veg capsules · UPC 7 33739 00037 8

DSLD also links this label to: Arginine & Citruline 500/250 (package size difference, same product), Arginine & Citruline 500/250 (package size difference, same product), Arginine & Citruline 500/250 (package size difference, same product), Arginine & Citrulline 500/250 (image difference, same product), Arginine & Citrulline 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?