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Citrulline vs. Arginine for Cognitive Stamina: Why the Combination Wins

By Dr. Marcus Vance, PharmD • Medically Reviewed • Updated October 2026

Pharmacokinetic trials reveal that oral L-citrulline elevates systemic plasma arginine levels higher and for longer than oral arginine itself by bypassing intestinal arginase degradation.

The Splanchnic Extraction Barrier

Upwards of 50% of ingested oral L-arginine is extracted by intestinal bacteria and hepatic arginases during first-pass transit. L-Citrulline completely escapes this breakdown, traveling to the kidneys where it is converted systematically into plasma arginine, sustaining nitric oxide synthesis across 8 to 12 hours.

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