L-Arginine is an amino acid your body uses to make nitric oxide, a signaling molecule involved in blood flow. People most commonly take it for circulation support and blood pressure support, and it also shows up in "pump" style pre-workout stacks (though many athletes prefer L-Citrulline for nitric-oxide related goals).
For shoppers, L-Arginine has two big gotchas: serving size math and label wording. The products that look cheapest often do so because they're powders (easy to dose) or because the label's "arginine" number is really L-Arginine HCl (a salt form that contains less arginine by weight). On the other end, very expensive options are often low-dose gummies or blends where you'd need many servings to reach a meaningful daily amount. The tables below use 6 g/day as a consistent comparison point so you can compare monthly cost across different forms.
Prices as of June 3, 2026. Prices update daily; this page updates monthly. For current prices and full interactive filters, see the L-Arginine compare page.
| Rank | Brand | Product | Form | Cost per month | Price |
|---|---|---|---|---|---|
| 1 | NOW Foods | NOW Foods Sports Nutrition, L-Arginine Powder, Nitric Oxide… | Powder | $7.19 | $40.03 |
| 2 | Nutricost | Nutricost L-Arginine Powder 500 Grams (1.1lbs) - Pure L-Arg… | Powder | $7.90 | $21.95 |
| 3 | BulkSupplements | BulkSupplements.com L-Arginine HCl Powder - Nitric Oxide Su… | Powder | $8.63 | $23.97 |
| 4 | Doctor's BEST | Doctors Best Pure L-Arginine Powder - L Arginine Supplement… | Powder | $11.39 | $18.99 |
| 5 | — | BEYOND RAW Chemistry Labs L-Arginine Powder, Fuels Exercise… | Powder | $49.98 | $24.99 |
| Rank | Brand | Product | Form | Cost per month | Price |
|---|---|---|---|---|---|
| 1 | Best Naturals | Best Naturals L-Arginine 3000mg Per Serving - 240 Tablets -… | Tablets | $13.49 | $17.99 |
| 2 | Amazing Nutrition | Amazing Formulas L-Arginine 1000mg Tablets | Amino Acid Su… | Tablets | $14.24 | $18.99 |
| 3 | Nutricost | Nutricost L-Arginine 1000mg, Amino Acid Tablets (300 Tablet… | Tablets | $15.57 | $25.95 |
| 4 | NOW Foods | NOW Foods Supplements, L-Arginine 700 mg, Nitric Oxide Prec… | Capsules | $18.57 | $13.00 |
| 5 | BulkSupplements | BulkSupplements.com L-Arginine HCl Capsules - Nitric Oxide… | Capsules | $22.76 | $18.97 |
See all L-Arginine products with full filter and sort options ->
1) Pick your "cheap vs convenient" form first (powder is usually the value winner). At a 6 g/day routine, powders tend to be the most cost-effective because it's easy to measure multi-gram servings. Capsules and tablets are often convenient for travel, but they can become expensive (and annoying) when you need several pills per day to hit grams.
2) Read the active line carefully: "L-Arginine" vs "L-Arginine HCl" (salt form). Many labels list L-Arginine HCl as the main ingredient. Because the "HCl" adds weight, 1,000 mg of L-Arginine HCl is not the same as 1,000 mg of L-Arginine. As a rough rule of thumb, L-Arginine HCl is about 83% L-Arginine by weight, so a "1,000 mg L-Arginine HCl" tablet is closer to ~830 mg of arginine. Some products avoid confusion by stating something like "L-Arginine (from L-Arginine HCl)," which typically means the listed number is the arginine amount. If you're comparing value, prioritize labels that make this clear.
3) Watch for formulas that aren't really "arginine products" (beet blends, extra actives, or tiny arginine doses). Some expensive listings are positioned as circulation or nitric-oxide products but include small amounts of L-Arginine alongside lots of other ingredients (or rely heavily on beetroot-style marketing). If you want L-Arginine specifically, look for a Supplement Facts line where L-Arginine (or L-Arginine HCl) is the primary active and the milligrams are meaningful.
4) Do the serving-size math: how many capsules/tablets would you actually take per day? If a product is 1,000 mg per tablet, you're looking at six tablets per day to reach 6 g (and potentially more if the label is in the HCl form). That can be fine for some people, but it's a very different experience than a powder scoop. The rankings account for servings per container, but the label tells you what your day-to-day routine looks like.
5) Expect a bigger "gummies premium" (and check if the gummies are simply under-dosed). Gummies are often priced like a premium format, but L-Arginine is typically used in grams, not tens or hundreds of milligrams. If a gummy serving only provides a few hundred milligrams, it will look dramatically more expensive at a 6 g/day comparison point because you'd need many servings per day.
6) Use quality and transparency as tie-breakers after the arginine math is clear. Once you've found a product with a clear arginine line and a routine you'll actually stick with, then compare practical signals: GMP statements, allergen info, whether the brand provides a Certificate of Analysis, and how much filler/sweetener you're comfortable with (especially for flavored powders and gummies).
Evidence for L-Arginine is moderate. Meta-analyses suggest small but consistent reductions in blood pressure at multi-gram daily intakes, while evidence for exercise performance and glucose control is weaker and more mixed. The 6 g/day benchmark here is for price comparison, not a claim that 6 g/day is the best dose for everyone.
L-Arginine can cause stomach upset for some people, especially at higher doses. Consider starting lower and splitting the dose (for example, morning/evening) if you're sensitive. If you have low blood pressure, take blood pressure medications, use nitrate medications, or take PDE5 inhibitors, check with a clinician before using high-dose L-Arginine. If your goal is nitric-oxide support for training performance specifically, you may also want to compare against L-Citrulline, which is commonly used for similar goals and often has better bioavailability.