About L-Citrulline Capsules

L-citrulline is a naturally occurring amino acid that supports nitric oxide production through a more efficient pathway than direct L-Arginine supplementation. Our fermented and vegan L-citrulline capsules provide 650mg of pure amino acid that converts to arginine in your body, promoting sustained blood flow, enhanced muscle pumps during exercise, and cardiovascular support.

Our L-Citrulline Story

Finding the right nitric oxide booster led us to discover that the supplement industry was missing a crucial piece of the puzzle. While L-arginine was popular for its quick effects, it suffered from poor bioavailability due to rapid conversion by the arginase enzyme. Research revealed that L-citrulline bypasses this limitation entirely, taking a longer route through the urea cycle to deliver more sustained and efficient arginine elevation.

We focus on pure, fermented L-citrulline rather than citrulline malate blends because the amino acid itself drives the nitric oxide benefits. Our capsules deliver the exact 650mg dose that research suggests is optimal for blood flow supplements, while our fermentation process ensures the highest purity and bioavailability. This approach gives you the sustained "all-day pump" that makes L-citrulline particularly valuable for fitness enthusiasts and anyone seeking cardiovascular support.

Benefits

• Enhances Nitric Oxide Production: L-citrulline converts to arginine in your body through the urea cycle, creating higher and more sustained nitric oxide levels than direct L-Arginine supplementation by bypassing the arginase enzyme that breaks down arginine before it can boost nitric oxide.
• Boosts Physical Energy: Higher nitric oxide levels promote vasodilation, allowing more oxygen and nutrients to reach working muscles during exercise, which supports performance and reduces fatigue during training sessions.
• Sustains Muscle Endurance: Better blood flow from increased nitric oxide production delivers nutrients to muscles while facilitating waste product removal, supporting prolonged exercise capacity and the coveted muscle pump sensation.
• Supports Workout Recovery: L-citrulline helps maintain healthy circulation and nutrient delivery post-exercise, while also supporting immune function that can become temporarily compromised after intense training sessions.

Beyond its direct effects on nitric oxide, L-citrulline also plays a role in the urea cycle, helping your body process ammonia waste that builds up during protein metabolism. This dual function makes it particularly valuable for athletes who consume higher protein diets and engage in regular intensive training.

Quality and Standardization

• Fermented Production: Our L-citrulline is produced through a controlled fermentation process, ensuring high purity and eliminating synthetic chemical residues commonly found in chemically synthesized amino acids.
• Vegan Certified: Completely plant-based and suitable for vegans, with no animal-derived ingredients or processing aids used during manufacturing.
• Third-Party Tested: Each batch undergoes comprehensive testing through independent third-party labs for identity confirmation, purity verification, and heavy metal screening.
• 650mg Pure Dosage: Each capsule contains exactly 650mg of L-citrulline with no fillers or artificial additives, allowing for precise dosing flexibility.
• Standardized Potency: We maintain consistent amino acid content across all batches through rigorous analytical testing and quality control protocols.

Mechanism of Action

• Nitric Oxide Synthase Pathway: L-citrulline works by converting to arginine through the urea cycle via argininosuccinate synthase and argininosuccinate lyase enzymes, then interacting with nitric oxide synthase (NOS) enzymes to generate nitric oxide and trigger the relaxation of blood vessel smooth muscle.
• Arginase Enzyme Bypass: Unlike direct arginine supplementation, L-citrulline circumvents the arginase enzyme that rapidly converts arginine to ornithine, allowing more arginine to remain available for nitric oxide synthesis and creating sustained vasodilation effects.
• Guanylate Cyclase Activation: The nitric oxide produced from L-citrulline activates guanylate cyclase, which synthesizes cyclic guanosine monophosphate (cGMP) that directly signals cardiovascular smooth muscles to relax and promote enhanced blood flow.
• Immune Function Support: L-citrulline supports immune cell function through its role in the urea cycle and nitrogen metabolism, helping maintain optimal cellular energy production and supporting the body's natural defense mechanisms during periods of physical stress.

Overview of the Science

L-citrulline supplementation demonstrates superior pharmacokinetic properties compared to direct arginine administration through enhanced bioavailability and sustained plasma levels [1]. Research indicates that oral L-citrulline supplementation produces more efficient nitric oxide synthesis by bypassing first-pass hepatic metabolism that typically degrades L-arginine before it can reach target tissues [2]. Clinical studies have demonstrated that L-citrulline supplementation significantly improves arterial blood flow and muscle oxygenation during exercise, particularly in populations with compromised vascular function [3]. Additionally, L-citrulline has shown promise in supporting ventricular function in heart failure patients, suggesting broader cardiovascular applications beyond exercise performance [4].

Exercise performance research reveals that citrulline supplementation enhances upper-body resistance exercise performance in recreationally trained individuals, with effects attributed to improved muscular endurance and reduced fatigue [5]. A comprehensive review of citrulline malate supplementation indicates that while acute performance benefits vary between studies, the amino acid consistently supports exercise capacity through enhanced nitric oxide-mediated blood flow [6]. The vasodilatory effects of citrulline extend beyond exercise applications, with studies demonstrating significant reductions in blood pressure and increases in vascular conductance in healthy young adults, positioning it as a potential therapeutic option for various vascular conditions [7]. These findings support L-citrulline's role not only in fitness applications but also in general vascular health maintenance.

[1] Schwedhelm E et al. Br J Clin Pharmacol. 2008;65(1):51-59.

[2] Romero MJ et al. Cardiovasc Drug Rev. 2006;24(3-4):275-90.

[3] Maharaj A et al. Nutrients. 2024;16(12):1935.

[4] Balderas-Munoz K et al. Cardiol J. 2012;19(6):612-7.

[5] Gonzalez AM et al. J Strength Cond Res. 2018;32(11):3088-3094.

[6] Gough LA et al. Eur J Appl Physiol. 2021;121(12):3283-3295.

[7] Alsop P et al. Eur J Appl Physiol. 2016;116(9):1651-61.

Ingredients

L-Citrulline:

• 650mg per capsule
• Naturally fermented production process
• Vegan-certified amino acid supplement
• Two capsules provide 1300mg daily dose

Our L-citrulline provides 650mg of pure amino acid per capsule, manufactured through controlled fermentation rather than chemical synthesis. This fermentation process eliminates impurities and chemical residues while ensuring consistent potency. The 650mg dosing allows for flexible intake, whether taking a single capsule for mild support or the full 1300mg (two capsules) for comprehensive blood flow enhancement and exercise performance benefits.