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Nutricost vs BulkSupplements L-Citrulline (2026)
Disclosure: We earn commissions on purchases made through our links. This never influences our scores. Editorial policy
The Verdict
These two are essentially tied on our rubric - Nutricost posts a 93 execution score to BulkSupplements' 92 on our 0-100 scale - and both are extremely cheap, at about $0.09-$0.13 per 3000mg dose. Nutricost carries ISO-accredited lab testing; BulkSupplements publishes a third-party COA. In our view this is a near coin-flip between two clean, single-ingredient value powders - buy whichever is cheaper per gram when you order. Both deliver pure L-citrulline at the studied dose.
Nutricost L-Citrulline Powder (300g)
Nutricost
BulkSupplements L-Citrulline Powder (500g)
BulkSupplements
Head-to-Head Comparison
| Category | Nutricost L-Citrulline Powder (300g) Nutricost | BulkSupplements L-Citrulline Powder (500g) BulkSupplements |
|---|---|---|
| Brand Score | 93/100Winner | 92/100 |
| Dosing & Form | 25/25Winner | 25/25 |
| Purity | 20/25Winner | 20/25 |
| Value | 25/25Winner | 25/25 |
| Transparency | 23/25Winner | 22/25 |
| Cost/Day | $0.13 | $0.09Winner |
| Dose/Serving | 3000mg | 3000mg |
| Form | pure L-citrulline powder (unflavored) | pure L-citrulline powder (unflavored) |
| Third-Party Tested | ✓ Yes | ✓ Yes |
| Proprietary Blend | No | No |
Why This Comparison Matters
Nutricost and BulkSupplements are the two dominant value brands for pure L-citrulline powder, the amino acid used for blood flow and exercise performance. Both sell unflavored, single-ingredient powder at the studied 3000mg dose, so this is a case where the active ingredient is identical and price plus testing decide it.
Both publish or claim third-party testing. For a commodity amino acid like L-citrulline, you want purity and an honest label at the lowest cost per dose.
We scored both on evidence, quality, cost per dose, and transparency.
Detailed Score Breakdown
Nutricost L-Citrulline Powder (300g)
Nutricost
Pure L-citrulline powder. 3g per scoop matches the lower end of the clinically effective range; two scoops (6g) hits the high end.
Third-party tested by ISO-accredited lab. GMP certified facility. No USP or NSF certification, but Nutricost has a consistent testing record.
$0.13/day at 3g or $0.26/day at 6g - among the cheapest per-gram options available. 100 servings per container at the base dose.
Single-ingredient product. Full disclosure, no proprietary blends, no fillers. Exactly what you want in a bulk amino acid powder.
Outstanding value for a pure, single-ingredient L-citrulline. 100 servings at 3g makes dosing flexible - use one scoop for maintenance, two for performance days.
BulkSupplements L-Citrulline Powder (500g)
BulkSupplements
Pure L-citrulline. 3g per serving aligns with clinical dosing.
Third-party tested, FDA-registered GMP facility. Certificates of analysis available on request. No NSF or USP certification.
$0.09/day at 3g or $0.18/day at 6g - the absolute lowest cost per gram in this category due to the 500g bulk bag.
Single ingredient, no fillers. The resealable bag packaging is functional but lacks the detailed labeling of bottled products. COAs available but not prominently linked.
Best raw cost per gram if you want maximum volume. The 500g bag will last over 5 months at 3g/day. No frills, no markup.
How We Compared These Products
Every product in our database is scored on four equally-weighted pillars: dosing accuracy and form quality, purity verification (third-party testing), cost per clinically effective dose (not cost per pill), and label transparency. Each pillar is worth 25 points for a total of 100.
Cost per effective dose is calculated using the clinically studied dose from published research, not the manufacturer's suggested serving. If a product requires multiple servings to reach the dose used in clinical trials, that cost is reflected in the value score.
For a full explanation of our scoring methodology, see our methodology page. Prices were last checked on the dates listed for each product and may have changed.
More L-Citrulline Comparisons
We earn commissions on purchases made through our links. This never influences our scores or recommendations. See our editorial policy.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before starting any supplement regimen.