Everything DoseRank tracks on the l-arginine shelf — L-Citrulline. The category itself is never ranked: 155 products get scored the moment you say what you want them to do.
How to read the scores
This legend covers the scores on this page — for data sources, scoring weights, and limits, read the full methodology →
Answer a few questions about your goals, habits, stack, and budget. Then, DoseRank will find the products that best match your needs based on your answers. It's free and only takes 60 seconds! No account is required.
A saved, shareable breakdown: your matched products, dose math, interaction flags to discuss with a clinician, and a price-tracked stack you can revisit.
Questions
Each product gets a composite score blending clinical strength, evidence, dose fit, trust and value — computed for the goal you picked, across this category's products. The #1 on the DoseRank tab has the highest composite; the other tabs re-rank the same products by Value, Trust, or Popularity. Placement is never paid.
Start with a goal, not a brand
Browsing l-arginine supplements without a goal makes no sense — different products do different jobs, and “best” flips depending on which job you're hiring for. These are the 45 health outcomes that matter for this category. Pick yours, and the full evidence-ranked shelf loads for that goal alone.
Nitric oxide bioavailabilityAvailability of nitric oxide relevant to vascular function.127 rankedModerate-strong
Vascular functionOverall health and reactivity of the circulatory system.119 rankedModerate-strong
Erectile functionAbility to achieve and maintain an erection.119 rankedModerate-strong
Endurance performanceAbility to maintain effort over a prolonged duration.126 rankedModerate-strong
Power outputAbility to generate force rapidly.27 rankedStrong
Insulin sensitivityEfficiency of tissue response to insulin.119 rankedModerate-strong
Gastrointestinal adverse eventUndesired digestive side effect such as nausea, diarrhea, or pain.38 rankedStrong
Blood pressureArterial pressure; direction of benefit depends on baseline status.134 rankedModerate-strong
Drug-supplement interactionClinically relevant interaction between a supplement and a medication.5 rankedStrong
Asthma controlDegree to which asthma symptoms and exacerbations are minimized.5 rankedLimited
Platelet functionPlatelet activity relevant to clotting and bleeding.5 rankedModerate-strong
Delayed-onset muscle sorenessPost-exercise muscle pain and stiffness.44 rankedModerate-strong
Endothelial functionAbility of blood vessels to dilate and respond normally.36 rankedLimited
Lean body massNon-fat body mass, often used as a marker of preserved musculature.19 rankedStrong
Liver functionOverall biochemical or clinical hepatic performance.15 rankedModerate-strongNothing is ranked yet — the shelf stays locked until you pick a goal.
No goal, no ranking.
A “best l-arginine supplement” list without a goal would be marketing, not evidence. Pick what you want to improve and DoseRank scores all 155 products against that goal's trials.