Best L-Arginine Supplements 2026: Cost per Effective Dose
Top pick for L-Arginine: Nutricost L-Arginine Powder (500 g) — 5000mg L-arginine per 1 scoop (5 g), Manufactured in a GMP facility, $0.26/day. Our best-value pick.
All L-Arginine Supplements Compared
All 5 products sorted by cost per labelled serving (lowest first). Dose, certification, and pricing verified against NIH DSLD and manufacturer data.
Read the dose column before the price column. Servings in this category are not equivalent — they range from 1,000 to 5,000 mg per serving. A lower cost per day here can simply mean a smaller serving, so the cheapest row is not automatically the best value.
| Product | Brand | Dose / Serving | Cost / Day | Certification | Pick | Buy |
|---|---|---|---|---|---|---|
| Nutricost L-Arginine Powder (500 g) | Nutricost | 5000mg 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 | 5000mg L-arginine / 1 scoop (5 g, HCl salt weight) | $0.29 | Manufactured in a GMP facility | Buy | |
| Nutricost L-Arginine 1,000 mg (300 Tablets) | Nutricost | 1000mg L-arginine / 1 tablet | $0.52 | Manufactured in a GMP facility | Buy | |
| NOW Foods L-Arginine 1,000 mg (120 Tablets) | NOW Foods | 1000mg L-arginine / 1 tablet | $0.85 | Manufactured in a GMP facility | Buy | |
| Pure Encapsulations L-Arginine 1,400 mg (90 Capsules) | Pure Encapsulations | 1400mg L-arginine / 2 capsules (1,400 mg) | $2.76 | None (practitioner brand) | Buy |
In-Depth L-Arginine Guides
Go deeper on l-arginine — by goal, by form, and what the evidence actually supports:
Our Picks
Best Value: Nutricost L-Arginine Powder (500 g)
5000mg L-arginine per 1 scoop (5 g). Manufactured in a GMP facility. $0.26/day. 100 servings per container at $21.95.
How We Rank L-Arginine Supplements
Every product is evaluated on three criteria:
- Cost per day. Not cost per pill or cost per bottle — what it actually costs per day at the product's labelled serving. Where a category's servings differ in strength we flag it above the table, because cost per day is only comparable when the doses are.
- Third-party certification. USP Verified, NSF Certified for Sport, and ConsumerLab Approved indicate independent testing for purity, potency, and contaminants.
- Bioavailable form. We prioritize products using the specific chemical form shown to be most effective in published research.
Rankings are not influenced by affiliate commissions. We earn the same commission regardless of which product you choose. Read our full methodology.
Personalize Your L-Arginine Choice
Not sure which l-arginine supplement is right for you? Use our free tools:
- DNA Supplement Analyzer — upload 23andMe or AncestryDNA data to check for genetic variants affecting l-arginine metabolism. Runs entirely in your browser.
- Lab Results Interpreter — enter your blood test values to get personalized dosing recommendations.
- Supplement Stack Builder — build a complete protocol based on your age, sex, medications, and goals.
- Supplement Audit — already taking l-arginine? Check if you have the right form and dose.