L-Citrulline Benefits: Performance, Blood Flow & Recovery

Written by: Ryan Gardner, Owner, Managing Partner, CEO, Bucked Up | Last updated: April 21, 2026

Key Takeaways

• L-citrulline supports nitric oxide production more effectively than L-arginine, which enhances blood flow and muscle pumps during workouts.¹
• Supplementation can significantly increase resistance training performance and endurance capacity in both strength and cardio sessions.¹
• Citrulline malate can noticeably reduce post-workout muscle soreness, which helps you recover faster between training days.¹
• Research supports daily use at typical workout doses, with 6–8g citrulline malate taken 30–60 minutes before training for performance.¹
• Experience these benefits with Bucked Up pre-workouts featuring effective doses—get your pre-workout here for stronger pumps and performance support.¹

How L-Citrulline Supports Performance and Blood Flow

L-citrulline is a non-essential amino acid that converts to L-arginine in the kidneys and supports nitric oxide production.¹ Dembicki et al.’s 2025 review analyzing 43 studies found that L-citrulline has superior bioavailability compared to L-arginine and more effectively increases plasma arginine concentrations.

The same research reported that L-citrulline supplementation improved endothelial-dependent vasodilation and supported VO₂ kinetics, reduced perceived exertion, and enhanced exercise tolerance.¹ These mechanisms create measurable performance advantages for lifters and endurance athletes who want more productive training sessions.

1. Enhanced Blood Flow & Pumps

Spanish researchers documented a 52% increase in bench press repetitions to failure at 80% 1RM after citrulline malate supplementation.¹ This improvement comes from L-citrulline’s support of nitric oxide production, which increases blood flow to working muscles and intensifies the pump.¹ Bucked Up Pre-Workout contains 6 grams of citrulline malate per serving, aligning with research-backed dosing.¹

2. Boosted Exercise Endurance

A 7-day regimen of 2.4g daily citrulline malate improved 4km cycling time trial performance by 1.5%.¹ For endurance athletes and regular gym-goers, this improvement reflects more sustained effort during training, without relying only on heavy stimulants for energy.

3. Faster Recovery

A meta-study published in the European Journal of Applied Physiology reports that citrulline malate supplementation prior to exercise reduced muscle soreness by 40% after 24 hours.¹ Faster recovery supports more frequent, higher-quality training sessions across the week.

L-Citrulline for Workouts and Pumps

These performance and recovery benefits become even more noticeable when you dial in L-citrulline specifically for pre-workout use.

4. Intense Pumps Through Nitric Oxide Support

L-citrulline supports nitric oxide production more effectively than direct L-arginine supplementation.¹ L-citrulline can outperform L-arginine for increasing nitric oxide availability because it bypasses first-pass metabolism in the gut and liver. For workout performance, take L-citrulline 30–60 minutes before training.

Mother Bucker features 4g L-citrulline plus Nitrosigine for targeted pump enhancement.¹ Try Mother Bucker for pumps that feel fuller and more sustained.

L-Citrulline Benefits for Exercise Endurance and Recovery

Once blood flow and pumps improve, endurance and recovery often follow because muscles receive more oxygen and nutrients during and after training.

5. Delays Fatigue and Buffers Ammonia

Comparative studies showed citrulline malate users achieving a 12.4% increase in total work versus 8.7% for pure L-citrulline, with 15% lower perceived exertion.¹ The malate component supports ATP production through the Krebs cycle, while L-citrulline helps clear ammonia buildup that contributes to fatigue.

6. Reduced Soreness and Perceived Exertion

Multiple studies report up to 40% reduction in muscle soreness 24 and 48 hours post-exercise with citrulline malate supplementation.¹ Less soreness supports consistent training, progressive overload, and better adherence to your program over time.

L-Citrulline for ED and Male Health (L Citrulline Benefits for Males)

Beyond exercise performance, L-citrulline’s vascular effects can extend to other areas of male health that also depend on healthy blood flow.

7. Support for Mild ED Through Blood Flow

L-citrulline may support mild erectile dysfunction through its role in nitric oxide production and vascular function.¹ Research suggests daily doses of 1.5–3g may provide benefits, and individuals should consult healthcare providers for personalized guidance before using it for this purpose.¹

L-Citrulline Side Effects and Safety Profile

Safety: Well-Tolerated at Typical Doses

Citrulline malate is well tolerated up to 10g daily, with no serious adverse events reported at oral doses up to 15g.¹ L-arginine is more likely to cause gastrointestinal side effects such as bloating and diarrhea at higher doses, whereas L-citrulline is generally better tolerated with fewer digestive issues.¹ Mild gastrointestinal effects can still occur in sensitive individuals at higher doses.

Optimal L-Citrulline Dosage and Timing for Training

Effective citrulline malate dosing ranges from 5–8g, providing roughly 3.4–4.5g of pure L-citrulline, with peak plasma concentrations within 0.7–2 hours.¹ For daily supplementation, 3–6g of pure L-citrulline supports general vascular health, while 6–8g of citrulline malate before workouts targets performance benefits.¹

Citrulline malate offers advantages over pure L-citrulline for exercise because the malate component supports energy production. This energy support becomes more effective when combined with beta-alanine, which buffers lactic acid and helps extend working sets, so Bucked Up pre-workouts pair these ingredients together.

Daily Use, Hormones, and L-Citrulline vs L-Arginine

Daily L-citrulline supplementation is considered safe for most healthy adults and may provide ongoing nitric oxide support. Research shows tolerance up to 10g daily with consistent benefits for vascular function and exercise performance.

L-citrulline does not directly increase testosterone levels. Its primary mechanisms involve nitric oxide production and vascular function rather than hormone changes.

L-citrulline can outperform L-arginine for increasing nitric oxide availability because it bypasses first-pass metabolism in the gut and liver, is converted to L-arginine in the kidneys, and produces more sustained increases in plasma arginine levels. This superior bioavailability makes L-citrulline a practical choice for performance-focused supplementation.

The table below shows how Bucked Up products use research-aligned citrulline doses compared to typical supplements, so you can see how label claims match the science.

Product	Citrulline Form/Dose	Vs. Typical Supp (3–6g)	Source
Bucked Up/Woke AF	6g Citrulline Malate (2:1) equiv. (~4g pure)	Matches or exceeds research doses	BarBend
Mother Bucker	4g L-Citrulline + Nitrosigine	Designed for pump enhancement	Bucked Up specs
Generic	2–4g	Often below optimal range	Market average

Why Bucked Up Pre-Workouts Pair Well With L-Citrulline

Bucked Up pre-workouts use transparent labels with clearly stated L-citrulline amounts across the product line. Bucked Up Pre-Workout includes 6,000mg of citrulline malate 2:1, which aligns with the doses associated with performance benefits in the research above.

For beginners, the standard Bucked Up pre-workout provides 200mg caffeine with 6g citrulline malate for balanced energy and pumps. Advanced users can move to Mother Bucker’s 4g pure L-citrulline plus Nitrosigine combination for more focused pump support.

Customer testimonials highlight real-world experiences such as “great pump… push harder” and “ability to push harder. The best preworkout I’ve ever had.”¹ These comments reflect how effective dosing and clear labeling can translate into noticeable training sessions compared to many generic alternatives.

Explore Bucked Up pre-workouts to experience L-citrulline support for your own performance goals.

Frequently Asked Questions

Is L-Citrulline Safe for Daily Use?

Yes, daily L-citrulline supplementation is considered safe for most healthy adults. As noted in the safety section above, research demonstrates excellent tolerance at standard supplementation doses. Start with 3–6g daily and adjust based on your response and training goals.

Can Women Benefit from L-Citrulline Supplementation?

Women can experience similar performance benefits from L-citrulline supplementation, including more repetitions in resistance training and improved exercise endurance.¹ The nitric oxide and blood flow mechanisms apply across genders.

Is Citrulline Malate Better Than Pure L-Citrulline?

For exercise performance, citrulline malate often provides advantages because the malate component supports energy metabolism through the Krebs cycle.¹ Studies show about 12% better work capacity with citrulline malate compared to pure L-citrulline, which makes it a popular form for pre-workout products.

Does L-Citrulline Actually Increase Testosterone?

No, L-citrulline does not directly increase testosterone levels. Its main benefits relate to nitric oxide production, vascular function, and exercise performance. Any perceived changes in male health likely come from better blood flow, not hormone shifts.

How Does L-Citrulline Compare to L-Arginine for Nitric Oxide?

As discussed earlier, L-citrulline generally outperforms L-arginine for nitric oxide support because of superior bioavailability. L-arginine undergoes extensive first-pass metabolism in the gut and liver, while L-citrulline bypasses this and converts to arginine in the kidneys, which supports more sustained arginine levels.

Conclusion: Put L-Citrulline to Work in Your Training

These seven performance benefits plus a favorable safety profile show why L-citrulline has become a go-to ingredient for serious lifters and endurance athletes. From stronger pumps and better endurance to faster recovery, effective dosing can translate into noticeable progress in the gym.¹

Bucked Up pre-workouts provide clear labels and research-aligned L-citrulline dosing so you can tap into these benefits consistently. Whether you start with the standard Bucked Up formula or move to Mother Bucker’s higher-stim and pump-focused combination, you get L-citrulline in amounts that match current evidence.

Start your transformation with the proven support of properly dosed L-citrulline in your pre-workout routine.

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