L-Citrulline Pure Powder - 4 oz

Product Overview & Quick Specs

Think of your blood vessels like flexible garden hoses that need to stay wide open. When vascular pathways relax, nutrient-rich blood flows effortlessly to your heart, brain, and active muscles. NOW Foods L-Citrulline Pure Powder provides an unflavored, free-form amino acid that fuels your natural nitric oxide pathways. Each half-teaspoon serving delivers clean circulatory expansion, immune defense support, and cellular waste clearance with zero added fillers.

• ✓ Active Form & Potency: Delivers 1.5 g (1,500 mg) of pure, free-form L-Citrulline in every 1/2 level teaspoon serving.
• ✓ Primary Target: Fuels systemic nitric oxide synthesis, promotes arterial blood flow, and accelerates liver urea cycle waste clearance.
• ✓ Supply & Value: Approximately 75 full servings per 4-ounce bottle, providing customizable dosing and exceptional cost efficiency.
• ✓ Purity & Dietary Status: 100% pure single-ingredient powder, non-GMO, vegan, and verified free of gluten, soy, dairy, nuts, and sesame.

Buyer's Guide & Form Comparison

Many sports pre-workout products use "citrulline malate" blends. Those formulas bond citrulline with malic acid, meaning you often receive only 50% to 67% actual citrulline by weight. Heavy malic acid powders can also trigger sharp stomach acidity and heartburn. Other shoppers rely on regular L-arginine, but gut enzymes destroy most of it before it reaches circulation. NOW Foods L-Citrulline Pure Powder delivers 100% pure free-form amino acid without acidic fillers or pill binders. Cheap commodity brands found in big-box stores often hide synthetic diluents and industrial impurities. NOW Foods tests every batch to guarantee verified purity, giving you full control over your daily nutrition.

Best Choice For:

• ✓ Athletes and fitness enthusiasts seeking stimulant-free muscle pumps, sustained endurance, and faster muscular recovery.
• ✓ Adults who prefer customizable powder dosing and dislike swallowing large capsules or hard tablets.
• ✓ Health-conscious shoppers looking for single-ingredient purity with zero artificial sweeteners, flavors, or chemical excipients.

Consider Another Option If:

• ✗ You travel frequently and prefer pre-portioned, grab-and-go capsules rather than carrying loose powder and a measuring spoon.
• ✗ You currently take prescription nitrates or blood pressure medications and have not yet consulted your physician.
• ✗ You want an immediate stimulant rush or skin-prickling sensation from added caffeine or beta-alanine.

VitaNet®, LLC has served health-conscious shoppers since 1995 with 31+ years of supplement curation, backing every purchase with an unconditional 100% money-back guarantee—even on opened bottles.

How It Works in the Body

Think of standard oral arginine like a delivery truck stuck at a congested border checkpoint. When you swallow regular arginine, digestive enzymes destroy most of it in your gut and liver (first-pass hepatic metabolism) [1]. Up to 70% never reaches your circulating bloodstream [1]. In contrast, think of L-Citrulline like an express train on a cleared rail. It slips right past liver enzymes completely unharmed and enters your systemic circulation intact [1].

Now think of your kidneys like a specialized manufacturing workshop. Once absorbed, your kidneys convert L-citrulline into fresh L-arginine using two internal enzymes (argininosuccinate synthetase and argininosuccinate lyase) [2]. This natural recycling sustains higher, longer-lasting blood levels of arginine than swallowing arginine pills directly [1]. Your vascular lining (endothelium) uses this steady supply to generate nitric oxide gas [1]. Nitric oxide commands arterial walls to relax and widen (vasodilation) [1]. This widening expands blood vessel pathways to deliver oxygen-rich blood to hard-working muscle tissues [3].

Picture strenuous exercise like running an automobile engine at top speed. Heavy physical exertion creates chemical exhaust inside your muscle tissues in the form of metabolic ammonia (NH₃) [4]. When ammonia accumulates, your muscle cells burn and fatigue quickly [4]. L-Citrulline serves as a key gear in your body's cellular waste-treatment facility (the urea cycle) [2]. It binds with metabolic waste to convert harmful ammonia into harmless urea [2]. Your kidneys then safely flush this urea out through your urine, speeding post-exercise recovery [2, 4]. This efficient waste clearance also supports healthy protein metabolism and promotes normal immune system function.

Daily Timing, Synergy & Realistic Timelines

Best Time to Take: Think of the absorption doorways in your small intestine like a narrow turnstile entrance. Taking free-form amino acids with heavy protein meals causes thousands of protein fragments to crowd the doorway (carrier transporter competition). For rapid cellular uptake, stir your powder into 8 ounces of water or fruit juice on an empty stomach. Take it roughly 30 to 45 minutes before meals or physical training.

Daily Schedule: Mix 1/2 level teaspoon (1.5 g) 1 to 2 times daily between meals. For workouts and muscular pumps, take 1/2 to 1 level teaspoon (1,500 mg to 3,000 mg) 45 minutes before exercise. On rest days, take 1/2 level teaspoon first thing in the morning with water, and an optional second serving in the afternoon.

Smart Pairings & Spacing: You can stack L-Citrulline with Vitamin C or Glutathione to shield nitric oxide from breakdown. It also pairs smoothly with Creatine Monohydrate to support cellular energy recycling during heavy lifting. Maintain a 2-hour separation window from whole-food protein shakes to prevent carrier competition in your gut.

What to Expect Over Time:

• Days 1–7: Rapid cellular uptake begins. You may notice fuller workout pumps and smoother exercise endurance without digestive heaviness.
• Weeks 3–4: Consistent tissue saturation occurs. Circulating arginine levels reach equilibrium, supporting faster ammonia clearance, reduced muscle soreness, and healthy peripheral warmth.
• Months 2–3+: Long-term cardiovascular maintenance. Cumulative nitric oxide production promotes sustained arterial elasticity, healthy blood vessel tone, and natural immune vitality.

Physical Feel, Sensory Traits & Clean Ingredients

Pill Format & Ease of Use: This product comes as a 100% pure, micro-fine crystalline powder. You never have to swallow bulky horse pills or chalky tablets. It dissolves rapidly in 8 ounces of cold water, fruit juice, or your favorite electrolyte beverage with just a few stirs of a spoon.

Natural Aroma, Taste & Color: The powder has a clean, completely neutral aroma with zero chemical smells. Unlike citrulline malate powders that taste aggressively sour, pure free-form L-Citrulline has a very mild, slightly tart flavor that easily blends into any drink. The powder is pristine white. Natural color variation may occur between batches due to raw-material harvesting.

Other Ingredients Explained:

Other Ingredients: None. This formula contains zero excipients. That means no magnesium stearate, no silicon dioxide, no synthetic flow agents, and no artificial sweeteners. Every single milligram inside the bottle is 100% active, bioavailable L-Citrulline.

Proper Storage: Store in a cool, dry place after opening. Keep the lid sealed tightly to guard against ambient humidity and heat. Do not eat the enclosed freshness packet; leave it in the bottle to absorb moisture. This bottle is made from 100% PCR (post-consumer recycled) resin to safeguard ingredient freshness while reducing environmental waste.

Manufacturer Quality & Lab Testing Standards

Many commodity supplement brands sold at big-box discount retailers buy raw amino acids from unverified foreign brokers. Those bargain bottles frequently suffer from synthetic degradation, unlisted fillers, and heavy metal residues. NOW Foods takes an entirely different scientific approach. Operating out of advanced testing laboratories in Bloomingdale, Illinois, NOW conducts over 19,000 analytical tests every month.

• Heavy Metal Screening (ICP-MS): Inductively Coupled Plasma Mass Spectrometry checks every batch for lead, arsenic, cadmium, and mercury down to parts-per-billion (ppb), exceeding California Proposition 65 standards.
• Active Potency Verification (HPLC): High-Performance Liquid Chromatography confirms that each batch delivers 100% pure, biologically active L-enantiomer citrulline without chemical diluents or amino spiking.
• Molecular Fingerprinting (FTIR): Fourier Transform Infrared Spectroscopy screens incoming materials against pure spectral standards to catch counterfeit ingredients at the door.
• Microbiological Safety: Automated testing verifies the absolute absence of harmful pathogens, including Salmonella, Escherichia coli, and Staphylococcus aureus.

NOW Foods manufacturing facilities maintain continuous Underwriters Laboratories (UL Solutions) cGMP registration and hold ISO/IEC 17025 accreditation for laboratory excellence, protecting your health with verified analytical purity.

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