L-Citrulline 500 mg – Nitric Oxide & Circulation, Exercise Endurance, Muscle "Pump" & Metabolic Recovery

L-Citrulline 500 mg, Nutricost, delivers free-form amino acid L-citrulline in a simple and clean formula, designed to support endogenous nitric oxide (NO) production, peripheral blood flow, and metabolic efficiency during exercise. After absorption, L-citrulline is converted to L-arginine at the kidney level, thus increasing the substrate for NO synthesis – an essential mediator of physiological vasodilation and rapid delivery of oxygen and nutrients to muscles. In parallel, L-citrulline participates in the urea cycle, helping neutralize ammonia produced during intense effort and contributing to a reduced feeling of fatigue. The result: increased endurance, pleasant muscle "pumping," faster recovery, and a boost of "clean" energy, suitable for both athletes and active individuals.

Detailed Benefits of L-Citrulline 500 mg

• Nitric Oxide (NO) Production and Efficient Microcirculation

Nitric oxide regulates blood vessel relaxation, optimizing tissue perfusion. By increasing L-arginine availability, L-citrulline supports NO synthesis.
✅ Physiological vasodilation and healthy blood flow
✅ Better delivery of oxygen and nutrients to muscles during exercise
✅ Circulatory comfort in daily activities

• Exercise Endurance and Energy Stability

Efficient circulation means "fuel" available exactly when you need it. L-citrulline favors efficient use of energy resources.
✅ Better ability to maintain intensity in cardio and strength training
✅ Lower perceived effort at the same workload
✅ Constant energy, without disruptive "peaks and crashes"

• Muscle "Pump" and Cellular Volume

When muscle perfusion is adequate, training feels "fuller," and contractions have quality.
✅ Motivating feeling of muscle "pumping"
✅ Accelerated nutrient delivery to muscle fibers
✅ Engaging feedback that supports focus and proper execution

• Metabolic Recovery and "Clearing" Residual Fatigue

L-citrulline participates in the urea cycle, supporting removal of ammonia accumulated during exercise.
✅ Reduction of heavy feeling in muscles after training
✅ Faster return between sets and between training days
✅ Clear feeling of "light legs" in endurance training

• Efficiency in Mixed Training: HIIT, Strength, Cardio

Whether you're doing intervals, heavy sets, or steady running, efficient blood flow makes the difference.
✅ Maintaining rep quality in strength training
✅ Stable rhythm in intense intervals (HIIT)
✅ Respiratory comfort and steady pace in cardio

• Mental Focus and Clarity During Exercise

Optimal oxygen supply to the brain is felt in the quality of decisions and neuromuscular coordination.
✅ Better concentration on technique and breathing
✅ Coherence in executing complex movements
✅ Reduced mental "noise" in key training moments

• Supporting Vascular Tone and Cardiometabolic Comfort

NO is part of the equation for healthy endothelium and coherent tissue perfusion.
✅ Support for endothelial function
✅ Efficient microcirculation in daily activities
✅ General feeling of well-being during prolonged effort

• Intelligent Nutritional Synergies

L-citrulline works excellently alongside:
✅ Electrolytes (sodium, potassium, magnesium) – for hydration and muscle contraction
✅ Easily absorbable carbohydrates – for rapid refilling of energy "tank"
✅ Nitrate-rich extracts (e.g., beetroot) – for an additional NO boost
✅ Quality proteins – for fiber reconstruction after exercise

• For Athletes, Active Professionals, and Beginners

Regardless of level, optimal blood flow supports performance.
✅ Runners, cyclists, paddlers: stable rhythm and strong finish
✅ Strength practitioners: sustained work volume and quality on final sets
✅ Beginners: easier transition toward regular training

• Fit with Modern Training Programs

From classic splits to full-body, WODs or 5K/10K plans, metabolic support matters.
✅ Adaptable to your routine, regardless of time
✅ Complement for morning sessions or after work
✅ Support on high-intensity days or double training

• Active Lifestyle: Office → Gym → Free Time

Transition between mental tasks and physical effort is smoother when tissue perfusion is efficient.
✅ Quick switch from "work mode" to "training mode"
✅ Useful energy for activities after gym
✅ Physical comfort that supports motivation

• Muscle Comfort and Mobility After Training

Good recovery means returning to the gym with eagerness, not fear of stiffness.
✅ Reduced feeling of post-effort "stiffness"
✅ More fluid movements in next session
✅ Consistency in progress, without unnecessary breaks

• Why L-Citrulline (and Not Direct L-Arginine)?

L-citrulline bypasses part of initial intestinal and hepatic metabolism, more sustainably increasing circulating L-arginine levels.
✅ Superior efficiency for NO support
✅ Friendly digestive tolerance
✅ Fit with endurance and strength goals

• Easy Integration into Healthy Habits

Good results come when you put together the important details.
✅ Proper hydration and balanced electrolytes
✅ Adequate sleep for recovery and muscle synthesis
✅ Coherent nutrition with goals (meals, strategic snacks)

• Well-Being That's Felt in Real Life

When circulation and metabolism work "with you," effort becomes pleasure.
✅ That feeling of "smooth-running engine" in heavy sets
✅ Finish with energy in runs or cycling
✅ Recovery that gives you confidence to progress gradually

L-Citrulline 500 mg, Nutricost, offers modern and efficient support for the nitric oxide-circulation-performance axis. From the first minutes of warm-up to the last set, L-citrulline supports tissue perfusion, muscle "pumping," endurance, and recovery, so your training has consistency, and progress becomes a natural consequence of a well-built routine.

Directions for Use

As a dietary supplement, take 2 capsules daily with 1 glass of water or as directed by a healthcare professional.

Other Ingredients

Gelatin capsule, magnesium stearate (vegetable source), stearic acid.

Warnings

For healthy individuals at least 18 years old. Consult a healthcare professional before use if you are pregnant or nursing, taking medication, or have a medical condition. Keep out of reach of children. Do not use if safety seal is broken or missing.
Store in a cool, dry place.