Best L-Arginine Supplements 2026: Cost per Effective Dose
Top pick for L-Arginine: Nutricost L-Arginine Powder (500 g) — 5,000mg L-arginine per 1 scoop (5 g), Manufactured in a GMP facility, $0.26/day. Our best-value pick.
All L-Arginine Supplements Compared
| Product | Brand | Dose / Serving | Cost / Day | Certification (as labelled) | Pick | Buy |
|---|---|---|---|---|---|---|
| Nutricost L-Arginine Powder (500 g) | Nutricost | 5,000mg L-arginine / 1 scoop (5 g) | $0.26 | Manufactured in a GMP facility | Best Value | Buy |
| BulkSupplements.com L-Arginine HCl Powder (500 g) | BulkSupplements | 5,000mg L-arginine HCl / 1 scoop (5 g, HCl salt weight) | $0.28 | Manufactured in a GMP facility | Buy | |
| Nutricost L-Arginine 1,000 mg (300 Tablets) | Nutricost | 1,000mg L-arginine / 1 tablet | $0.52 | Manufactured in a GMP facility | Buy | |
| NOW Foods L-Arginine 1,000 mg (120 Tablets) | NOW Foods | 1,000mg L-arginine / 1 tablet | $0.85 | Manufactured in a GMP facility | Buy | |
| Pure Encapsulations L-Arginine 1,400 mg (90 Capsules) | Pure Encapsulations | 1,400mg L-arginine / 2 capsules (1,400 mg) | $2.76 | None (practitioner brand) | Buy |
Registry check · L-Arginine
Does anyone independently verify L-Arginine supplements?
We did not find any of these products in a public registry, and none of the listings names a certification mark. Where a listing names a mark, we say so in the table; where we could not find it in a registry, we say that instead.
The 5 products on this page checked against all 5,317 US NSF, USP and Informed Sport listings, 2026-08-25. Full method and limitations.
What L-Arginine labels show
Priced per day, these L-arginine products run $0.26 to $2.76 — a 11× gap between the cheapest and dearest L-arginine here, across 4 brands.
Our Picks
Best Value: Nutricost L-Arginine Powder (500 g)
5,000mg L-arginine per 1 scoop (5 g). Manufactured in a GMP facility. $0.26/day. 100 servings per container at $21.95.
The shelf · L-Arginine
Capsules cost 5.1× what powder does for the same L-Arginine
The molecule is the same either way; the premium buys encapsulation. Across these 5 L-Arginine products that gap runs from $0.26 a day (Nutricost L-Arginine Powder (500 g)) to $2.76 (Pure Encapsulations L-Arginine 1,400 mg (90 Capsules)), and Nutricost L-Arginine Powder (500 g) is the cheapest powder of the 2 here if you will actually weigh a dose.
Method: the 5 L-Arginine products above, compared on label facts, serving size, servings per container, form, price. Not a dosing recommendation.
How these 5 L-Arginine products were ranked
Not one of these 5 L-arginine products could be confirmed in the NSF, USP or Informed Sport registries, so verification separates none of them and the ranking falls to cost per day at the labelled serving. Commission does not enter it: the rate is the same whichever L-arginine you buy. Full methodology.