Arginine & Ornithine 500/250 – Nitric Oxide and Circulation, Endurance and Muscle "Pump", Detox through Urea Cycle and Metabolic Recovery

Arginine & Ornithine 500/250, Now Foods combines two key amino acids, L-arginine (free form) and L-ornithine, in a balanced formula that supports nitric oxide (NO) production, circulation, performance during effort and natural metabolic detox processes. Each serving delivers 1,000 mg L-arginine and 500 mg L-ornithine (from L-ornithine hydrochloride), dosage oriented toward both vasodilation and nutrient distribution to muscles, as well as ammonia neutralization through the urea cycle, for recovery perceived as cleaner and more coherent.
 

The synergy between arginine and ornithine supports, in parallel, creatine biosynthesis, nutritional transport to muscle fibers and clarity during workouts, offering a pleasant "feel" of strength or endurance sessions. The simple formula, without stimulants, is easy to integrate into the routine of active people, amateur athletes or those who want stable energy and tone for demanding days.

Detailed Benefits of Arginine & Ornithine 500/250, Now Foods

• Nitric oxide (NO) production and efficient blood flow

L-arginine is a direct precursor for nitric oxide, the key mediator of endothelial vasodilation. Increasing NO availability supports:
• blood flow to muscles and tissues during effort;
• oxygenation and nutrient delivery in critical training "windows";
• natural "warm-up" and vascular comfort in prolonged sets.

✅ Optimal muscle perfusion in training
✅ Comfort and satisfying "pumping"
✅ Accelerated delivery of amino acids and glucose
 

• Endurance, "pump" and muscle contraction quality

When muscle perfusion is optimal, contraction quality and perceived endurance increase:
• visible muscle "pump" and better neuromuscular feedback;
• consistent rhythm for longer durations, with sense of control;
• support for volume, density and "mind-muscle connection".

✅ Intense and satisfying "pump"
✅ Increased endurance set after set
✅ Control and coordination in execution
 

• Urea cycle: ammonia neutralization and metabolic "cleanliness"

L-ornithine is a central link in the urea cycle, mechanism by which the body transforms ammonia (exercise metabolite) into urea for elimination:
• reduction of ammonia accumulation associated with fatigue;
• clearer "head" at the end of session;
• more pleasant recovery between workouts.

✅ Metabolic detox after effort
✅ Comfort and post-session clarity
✅ Continuity in sports program
 

• Creatine biosynthesis and explosive energy support

L-arginine participates, alongside glycine and methionine, in creatine synthesis, important for rapid ATP restoration in high-intensity efforts:
• more consistent first repetitions;
• power "burst" in heavy sets;
• synergy with performance-oriented strategies.

✅ Basis for rapid energy reserves
✅ Power in short and intense efforts
✅ Compatible with strength objectives
 

• Recovery and maintaining training rhythm

By improving blood flow and supporting the urea cycle, the arginine-ornithine mix:
• favors metabolic waste elimination;
• supports tissue restoration within physiological limits;
• helps maintain consistency from one session to another.

✅ Faster perceived revitalization
✅ Post-effort muscle comfort
✅ Consistency – the ingredient of progress
 

• Cardio-metabolic comfort and "trained" endothelium

A flexible endothelium responds better to intensity changes:
• smooth adaptation between warm-up, peak and recovery;
• sensation of lightness in intervals and circuits;
• support for cardio activities and mixed effort.
✅ Adaptation to tempo variations
✅ "Flow" in interval sessions
✅ Comfort in sustained efforts
 

• Focus, "drive" and mental rhythm in the gym

When oxygen and nutrient distribution is efficient, focus quality also increases:
• maintaining attention on technique;
• coherent mental rhythm, without "drops";
• superior coordination and control throughout the session.

✅ Stable focus and confidence in execution
✅ Cleaner technique, rep after rep
✅ Improved neuromuscular feedback
 

• Nutritional synergy: easy to integrate into varied strategies

Without stimulants, the formula combines simply with:
• fast/isotonic carbohydrates for prolonged effort;
• proteins and creatine for strength and lean mass;
• electrolytes for hot or long-duration sessions.

✅ Versatile in pre-/intra-workout
✅ Fits with diverse protocols
✅ Easy to customize by objective
 

• Support for dynamic lifestyles and unpredictable schedules

When days are full, you need predictable support:
• perfusion and clarity "boost" when needed;
• cleaner recovery when sessions are close together;
• minimum effort for routine integration.

✅ Practical for "on-the-go"
✅ Help in frequent training cycles
✅ Simple, direct, efficient
 

• Compatible with multiple objectives: strength, endurance, recomposition

Regardless of target, arginine and ornithine address the fundamentals:
• nutrient delivery, oxygen and metabolic "cleanliness";
• support for contraction and recovery quality;
• metabolic framework favorable to progress.

✅ Suitable for strength, HIIT, cardio
✅ Foundation for "clean" training
✅ Aligned with recomposition programs

Usage instructions

Take 2 capsules daily, as needed, preferably with juice or water on an empty stomach, before exercise or before bedtime.

Other ingredients

Hypromellose (cellulose capsule) and stearic acid (vegetable source).
Manufactured and quality tested in the USA with globally sourced ingredients. 
Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut or sesame ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.

Warnings

For adults only. Do not use if you have a history of myocardial infarction or diagnosed coronary artery disease. Consult your physician if you are pregnant/nursing, taking medications or have a medical condition (including herpes and/or glaucoma). Keep out of reach of children.
Natural color variation may occur in this product.
Store in a cool, dry and dark place after opening.