L-citrulline is a non-essential amino acid that your body converts into L-arginine, which then gets used to make nitric oxide — the molecule that relaxes blood vessels and improves blood flow. People take it for the "pump" before workouts, for blood pressure support, and for circulation-related concerns like mild erectile dysfunction. It's one of the few supplements where the powder form genuinely dominates the market, because effective doses (3–6 g/day) are awkwardly large for capsules. Most studies use 6 g/day, taken either as a single pre-workout dose or split through the day.
This page compares L-citrulline products by cost per month at a reference dose of 6 g/day. Rankings are based on the amount of L-citrulline listed on the Supplement Facts label divided into the product's price. One product per brand in each table; lowest cost per month wins.
Prices as of May 1, 2026. Prices update daily; this page updates monthly. For current prices and full interactive filters, see the L-Citrulline compare page.
| Rank | Brand | Product | Form | Cost per month | Price |
|---|---|---|---|---|---|
| 1 | BulkSupplements | BulkSupplements.com L-Citrulline Powder - Citrulline Supple… | Powder | $6.12 | $33.97 |
| 2 | Best Naturals | Best Naturals L-Citrulline Malate 2:1 Powder 1 Lb | Powder | $8.93 | $14.99 |
| 3 | Nutricost | Nutricost Pure L-Citrulline (Base) Powder (600 Grams) | Powder | $8.98 | $29.95 |
| 4 | Primaforce | PrimaForce L-Citrulline Malate Powder, Unflavored, 500 Gram… | Powder | $14.57 | $26.99 |
| 5 | Healthy Origins | Healthy Origins - L-Citrulline (American-Made, Non-GMO, Glu… | Powder | $14.99 | $24.99 |
| Rank | Brand | Product | Form | Cost per month | Price |
|---|---|---|---|---|---|
| 1 | Bucked Up | Bucked Up L-Citrulline 200 Capsules | 1500mg Per Serving \… | Capsules | $17.94 | $14.95 |
| 2 | Carlyle | Carlyle L Citrulline 1600mg | 200 Capsules | for Men and… | Capsules | $19.68 | $17.49 |
| 3 | Primaforce | Primaforce L-Citrulline 2500mg, 240 Tablets, 120 Servings | Tablets | $19.77 | $32.95 |
| 4 | Horbäach | Horbaach L Citrulline Supplement for Men and Women | 2400… | Capsules | $20.61 | $16.49 |
| 5 | Primal | Primal L-Citrulline Capsules (180 Capsules / 1,500 mg Per S… | Capsules | $21.32 | $15.99 |
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L-citrulline vs. citrulline malate. This is the single biggest source of confusion on labels. Citrulline malate 2:1 is L-citrulline bonded with malic acid in a roughly 2-to-1 ratio, so a product listing "6 g citrulline malate" actually delivers about 4 g of L-citrulline. If a product says "citrulline malate" without specifying a ratio, you can't calculate the actual citrulline dose — and independent testing has found a meaningful share of malate products miss their stated ratio anyway. For an apples-to-apples cost comparison, look for "L-citrulline" listed in milligrams, or "citrulline malate 2:1" with the ratio printed on the label. TrueServing's rankings handle this automatically — citrulline malate products are normalized to their actual L-citrulline content, so the cost-per-month figures in the tables above are comparable regardless of which form a product uses.
Capsule count to hit a real dose. Most capsule products contain 750–1,000 mg of L-citrulline per capsule. To reach 6 g/day, that's 6–8 capsules daily. Before comparing prices, check the Supplement Facts panel for capsules per serving and servings per container — a "120-capsule" bottle that requires 8 capsules a day only lasts 15 days. This is why powder almost always wins on cost per month at clinically used doses.
Watch for proprietary blends. Many pre-workout formulas list citrulline inside a "pump matrix" or "performance blend" with a single combined milligram total. You have no way to know how much citrulline is actually in there. Single-ingredient citrulline products — powder or capsule — are the only way to compare doses honestly. If you want a stack, see Beta-Alanine or Creatine Monohydrate as separate single-ingredient products you can dose precisely.
Flavored vs. unflavored powder. Flavored citrulline powders are convenient but usually contain sweeteners, acids, and sometimes other actives that change cost-per-gram math. Unflavored L-citrulline is the cleanest comparison — it's bitter and slightly sour, so most people mix it with juice or a flavored electrolyte. If you're already drinking a flavored pre-workout, unflavored citrulline added on top is typically the cheapest path to a full dose.
L-citrulline vs. L-arginine. Counterintuitively, oral L-citrulline raises blood arginine levels more effectively than oral L-Arginine does, because arginine is heavily broken down in the gut and liver before it reaches circulation. If your goal is raising arginine for nitric oxide production, citrulline is generally the more efficient choice — though arginine has its own niche uses.
Evidence for L-citrulline is moderate overall, with quality varying by use case. Multi-day supplementation at 6 g/day of pure L-citrulline shows reasonably consistent benefit for blood pressure and exercise tolerance in small-to-medium trials. Single-dose pre-workout citrulline malate — the most heavily marketed use — has produced inconsistent results in well-controlled studies despite its popularity. Evidence for mild erectile dysfunction is emerging from small trials at 1.5–3 g/day. Typical doses range from 3 to 8 g/day; no upper limit has been established, and doses up to 15 g have been studied short-term. Side effects are uncommon and mild — mostly stomach discomfort at higher doses. Because citrulline lowers blood pressure through nitric oxide, anyone taking blood pressure medication or PDE5 inhibitors (sildenafil, tadalafil) should talk to a doctor before adding it.