Best Citrulline for Heart
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Last reviewed May 2026
Clinical dose: 3000–6000 mg
Why Citrulline for Heart
Citrulline plays a supporting role in heart. L-Citrulline is a non-essential amino acid that converts to L-arginine in the kidneys, raising plasma arginine and nitric oxide levels more effectively than oral arginine supplementation (arginine undergoes significant first-pass metabolism). Well-tolerated with no established UL.
What dose to look for
Clinical studies typically use 3000–6000 mg of citrulline. 3-6g/day for NO-mediated blood flow and exercise performance. Citrulline malate studies often use 6-8g (which contains ~3-4.5g pure citrulline). Products below this range may not deliver meaningful results.
What the research says
Citrulline has moderate clinical evidence for heart benefits. Several trials show it raises nitric oxide more effectively than oral arginine for blood flow Learn more
Clinical research on L-Citrulline
MODERATE — Growing RCT base for blood pressure via nitric oxide · 3,000–6,000 mg/day
- •2019 meta-analysis of 10 RCTs found L-citrulline supplementation significantly reduced systolic BP by 4.1 mmHg, with a stronger effect in hypertensive adults. PubMed
- •Citrulline is more effective than L-arginine at raising plasma arginine and nitric oxide levels — citrulline bypasses first-pass metabolism in the liver, whereas arginine is partially degraded by arginase.
- •Also improves exercise capacity and reduces arterial stiffness. Citrulline malate form is preferred for athletic performance, but pure L-citrulline is equivalent for cardiovascular endpoints.