Arginine
Description
Arginine is a conditionally essential amino acid, meaning that while the body can usually produce it, supplementation might be necessary under certain conditions like stress, rapid growth, or illness. It serves as a crucial precursor to nitric oxide (NO), a powerful signaling molecule that promotes vasodilation, helping to relax and widen blood vessels. This action is fundamental for improving circulation and supporting various aspects of cardiovascular health. Beyond its role in nitric oxide synthesis, Arginine is integral to the process of protein synthesis, making it essential for muscle growth and repair. It is also actively involved in the urea cycle, facilitating the removal of ammonia, a toxic waste product, from the body. Furthermore, Arginine supports a robust immune system by enhancing the activity of immune cells and is critical for effective wound healing and tissue regeneration, aiding recovery from injuries or surgical procedures. Popular in sports nutrition, Arginine is often used to potentially enhance exercise performance and reduce recovery time, attributed to its ability to improve blood flow and nutrient delivery to working muscles. It also contributes to hormone secretion, notably growth hormone. Arginine can be obtained through a diet rich in protein and is widely available as a dietary supplement.
Sources
Red meatPoultryFishDairy products (milk, yogurt, cheese)Nuts (peanuts, almonds, walnuts)Seeds (pumpkin seeds, sesame seeds)Legumes (soybeans, chickpeas, lentils)Whole grains
Cheapest Arginine Supplements
Best Arginine Supplements
Value Arginine supplements
Optimal Dosage
Minimum2000 mg
Maximum6000 mg
Safety & Toxicity
Goals
Cardiovascular Support
Impact
Highest effect
Typical dose:2–9 grams
L-Arginine is a critical substrate for nitric oxide synthase (NOS), the enzyme responsible for producing nitric oxide (NO). NO is a potent vasodilator, meaning it helps relax and widen blood vessels. This improved vasodilation supports healthy blood pressure, enhances circulation throughout the body, and contributes to overall cardiovascular well-being.
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Fitness
Impact
High effect
Typical dose:3–8 grams
Enhanced nitric oxide production from Arginine leads to increased blood flow to working muscles during exercise. This improved circulation facilitates better delivery of oxygen and nutrients, while simultaneously aiding in the removal of metabolic byproducts like lactic acid. The result can be enhanced endurance, reduced fatigue, and improved overall athletic performance and recovery.
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Energy
Impact
Moderate effect
Typical dose:2–6 grams
Arginine's ability to boost nitric oxide production leads to improved circulation, ensuring that cells throughout the body receive a more efficient supply of oxygen and vital nutrients. This optimized delivery supports the metabolic processes responsible for energy generation, potentially reducing feelings of fatigue and promoting sustained energy levels for daily activities and physical exertion.
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Muscle Gain
Impact
Moderate effect
Typical dose:3–8 grams
While not a direct anabolic agent, Arginine contributes to muscle gain indirectly. Its role in boosting nitric oxide enhances blood flow, ensuring muscles receive ample oxygen, amino acids, and glucose necessary for repair and growth post-exercise. Furthermore, Arginine can stimulate the release of growth hormone (GH), which plays a significant role in muscle protein synthesis and tissue regeneration.
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Interactions
Positive Interactions
Citrulline
Citrulline is converted to Arginine in the body, leading to sustained increases in Arginine levels and enhanced nitric oxide production.
Vitamin C
Vitamin C may protect nitric oxide from oxidative degradation, potentially enhancing Arginine's vasodilatory effects.
Folate
Folate is essential for the function of nitric oxide synthase, the enzyme responsible for producing nitric oxide from Arginine.
Coenzyme Q-10
May synergistically improve cardiovascular health and endothelial function when combined with Arginine.
Omega-3
May enhance cardiovascular benefits and anti-inflammatory effects when combined with Arginine.
Creatine
Arginine's ability to improve blood flow may enhance the delivery of creatine to muscles, potentially boosting exercise performance.
Negative Interactions
Turmeric
Both Arginine and Turmeric have anti-platelet effects, potentially increasing the risk of bleeding when taken together, especially in susceptible individuals.
Green Tea
Green Tea, particularly its catechins, can impact blood pressure. Combining with Arginine, which also affects blood pressure, should be approached with caution, especially for individuals on blood pressure medication.
Recommended products
Value 
L-Arginine 500 mg
Natural Factors
Arginine: 1000 mg
A practical 1000mg L-Arginine HCl serving (two capsules) from Natural Factors, suitable for cardiovascular and fitness support in a smaller package.
Best 
Wellness ImmuNitric
Source Naturals
Arginine: 2400 mg
This product combines L-Arginine and L-Citrulline with supportive B vitamins to help with nitric oxide production, which may assist cardiovascular function and exercise performance.
Best 
Wellness ImmuNitric
Source Naturals
Arginine: 2250 mg
Wellness ImmuNitric combines L-Arginine and L-Citrulline to support healthy blood flow and cardiovascular function, complemented by B vitamins for energy metabolism.
Budget 
L-Arginine 500 mg
Swanson
Arginine: 500 mg
An incredibly economical 500mg L-Arginine capsule from Swanson, delivering ample servings for consistent cardiovascular and fitness support.
Best 
MacroMeal Ultimate Vanilla Protein Powder
MacroLife Naturals
Arginine: 2392 mg
This is a plant-based, multi-ingredient protein powder with superfoods and digestive support, available in a smaller, more expensive-per-serving vanilla package.
Value 
L-Arginine 1000 mg
21st Century
Arginine: 1000 mg
A very popular and budget-friendly 1000mg L-Arginine HCl tablet from 21st Century, excellent for strong cardiovascular and fitness support.
Value 
Arginine 1000 mg
Jarrow Formulas
Arginine: 1000 mg
A top-tier 1000 mg L-Arginine supplement known for its strong dosage, excellent price, and widespread customer approval.
Budget 
L-Arginine 500 mg
Swanson Premium Brand
Arginine: 500 mg
An extremely budget-friendly 500mg L-Arginine capsule from Swanson Premium Brand, suitable for foundational cardiovascular and fitness support.
Best 
MacroMeal Ultimate Vanilla Protein Powder
MacroLife Naturals
Arginine: 2392 mg
A plant-based protein powder with added superfoods, digestive enzymes, and probiotics, delivering comprehensive nutritional support in a vanilla flavor.
Best 
Arginine Citrulline
MNP Michael's Naturopathic Programs
Arginine: 2250 mg
A high-potency L-Arginine, L-Citrulline, and Beet extract tablet supplement from MNP Michael's Naturopathic Programs, providing strong nitric oxide support in a larger, more economical size.
Best 
L-Arginine 1000 mg
Bluebonnet
Arginine: 3000 mg
A very high-dose L-Arginine supplement from Bluebonnet, offering 3000 mg per serving, but with a high price and minimal reviews.
Best 
L-Arginine 3000 mg
Natrol
Arginine: 3000 mg
This supplement provides a high dose of L-Arginine for circulation and performance support, complemented by key B vitamins for energy and metabolic functions.
Budget 
Pharmaceutical Grade AjiPure L-Arginine 500 mg
Swanson Ultra
Arginine: 500 mg
Swanson Ultra's AjiPure L-Arginine 500 mg capsule emphasizes a 'pharmaceutical grade' ingredient source, offering a pure and moderate dose.
Best 
Nitri Oxide Support
Pure Encapsulations
Arginine: 2050 mg
This supplement combines L-Arginine, Citrulline, and Vitamin C to support nitric oxide production and circulation, making it suitable for general cardiovascular and mild fitness support.
Value 
L-Arginine 1000 mg
Solgar
Arginine: 1000 mg
A dependable 1000mg L-Arginine HCl tablet from Solgar, suitable for supporting cardiovascular health and workout performance with a clear, single ingredient focus.
Budget 
L-Arginine 500 mg
Best Naturals
Arginine: 500 mg
An extremely economical 500mg L-Arginine HCl capsule from Best Naturals, offering a huge supply for consistent cardiovascular and fitness support.
Value 
L-Arginine L-Citrulline Complex
Source Naturals
Arginine: 750 mg
A high-value, large-count L-Arginine HCl and L-Citrulline tablet supplement from Source Naturals, ideal for sustained cardiovascular and fitness support.
Value 
L-Arginine 850 mg Maximum Strength
Swanson
Arginine: 850 mg
A high-potency 850mg L-Arginine capsule from Swanson, offering strong support for cardiovascular health and fitness at a great price.
Value 
L-Arginine Caps 700 mg
Life Extension
Arginine: 700 mg
A highly rated L-Arginine supplement from Life Extension, offering a good 700 mg dose at a very affordable price.
Best 
Vein Erect with L-Arginine & Maca
Mason Natural
Arginine: 2500 mg
Mason Natural's Vein Erect combines a robust 2500mg L-Arginine HCl with Maca and Calcium, targeting cardiovascular and vitality support in a multi-capsule serving.
Value 
L-Arginine 700 mg
NOW
Arginine: 700 mg
A highly economical 700mg L-Arginine capsule from NOW, providing ample servings for consistent cardiovascular and fitness support.
Best 
L-Arginine Pure Powder
Best Naturals
Arginine: 4600 mg
A highly potent L-Arginine powder, offering flexible dosing and excellent value for those seeking significant L-Arginine intake.
Value 
L-Arginine L-Citrulline Complex 1000 mg
Best Naturals
Arginine: 750 mg
A large-count L-Arginine HCl and L-Citrulline tablet supplement, offering a higher arginine dose per serving for cardiovascular and fitness support.
Budget 
L-Arginine 500 mg
California Gold Nutrition
Arginine: 500 mg
An outstanding L-Arginine supplement providing 500 mg per serving at an incredibly low price, backed by extensive customer satisfaction.
Budget 
L-Arginine + L-Citrulline 750 mg
Nutricost
Arginine: 500 mg
A high-value L-Arginine and L-Citrulline capsule supplement from Nutricost, featuring a balanced dosage and excellent price per serving.
Value 
Arginine & Citrulline 500 mg / 250 mg
NOW Sports
Arginine: 500 mg
A high-value, large-count L-Arginine and L-Citrulline capsule supplement from NOW Sports, ideal for consistent daily use to support blood flow and performance.
Product stats
Price per product
Average$30.06
Median$23.25
Price per serving
Average$1.01
Median$0.74
Price per 100 mg
Average$0.29
Median$0.08
Price distribution
Price per serving distribution
Price per 100 mg
Reference amount: 100 mg
Forms
Paired ingredients
Ingredient forms
L-Arginine Hydrochloride (18) 80
L-Arginine Hydrochloride (L-Arginine HCl) is a stable, salt form of the essential amino acid L-Arginine. It is highly soluble in water, which makes it a popular choice for dietary supplements. As a precursor to nitric oxide (NO), L-Arginine HCl supports various physiological functions, including vascular health, blood flow, and potentially enhancing exercise performance. The hydrochloride component improves its stability and solubility, though it slightly reduces the actual L-Arginine content per gram compared to free-form L-Arginine.
Pros
- Enhanced water solubility and stability
- Widely available and cost-effective
- Supports nitric oxide production for improved blood flow
- Well-established safety profile
Cons
- Contains less elemental L-Arginine by weight compared to free-form L-Arginine
- May cause mild gastrointestinal discomfort in some individuals at higher doses due to acidity
Per product
Avg$22.51
Med$19.00
Per serving
Avg$0.83
Med$0.73
Per 100 mg
Avg$0.02
Med$0.02
Price distribution
L-Arginine Pyroglutamate (2) 75
L-Arginine Pyroglutamate combines L-Arginine with pyroglutamic acid, an amino acid derivative naturally found in the brain. This combination is theorized to enhance the absorption and transport of L-Arginine, potentially improving its efficacy for various physiological processes, including nitric oxide production. Some suggest pyroglutamic acid may also facilitate L-Arginine's passage across the blood-brain barrier, offering potential cognitive benefits. While L-Arginine itself is well-researched, specific studies on the unique advantages of this combined form compared to other Arginine forms are less extensive.
Pros
- Pyroglutamic acid may enhance L-Arginine absorption and brain uptake
- Potential for synergistic cognitive benefits due to pyroglutamic acid
- Supports nitric oxide production and related cardiovascular and exercise benefits
Cons
- Less common and potentially more expensive than L-Arginine HCl
- Specific research on the superior benefits of this combined form versus L-Arginine alone is limited
Per product
Avg$18.11
Med$18.11
Per serving
Avg$0.81
Med$0.81
Per 100 mg
Avg$0.27
Med$0.27
Price distribution