Citrulline

Description

Citrulline is an alpha-amino acid that, while not incorporated into proteins during synthesis, plays a critical role in the urea cycle. This metabolic pathway is essential for converting excess ammonia, a toxic byproduct of protein metabolism, into urea, which can then be safely excreted from the body. This detoxification process is fundamental for maintaining proper physiological function and preventing the harmful accumulation of ammonia. Of particular significance, Citrulline can be efficiently converted into L-arginine in the kidneys. Arginine is the direct precursor for nitric oxide (NO), a powerful vasodilator that signals blood vessels to relax and widen. This improved vasodilation leads to enhanced blood flow, facilitating the delivery of oxygen and nutrients to active muscles, which is highly beneficial for both exercise performance and post-exercise recovery. Consequently, Citrulline is widely utilized as a supplement to support athletic endurance, reduce muscle fatigue and soreness, and promote overall cardiovascular health by helping to regulate blood pressure and improve circulation. It is naturally present in certain foods and is a popular ingredient in sports nutrition and formulations aimed at vascular support.

Sources
WatermelonCucumbersPumpkinsSquashBitter melon
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Optimal Dosage
Minimum3000 mg
Maximum6000 mg
Safety & Toxicity
Goals
Cardiovascular Support
Cardiovascular Support
Impact
High effect
Typical dose:1500–6000 mg
As the most bioavailable and effective oral supplement for increasing arginine levels and boosting nitric oxide, L-citrulline is a top-tier intervention for improving blood flow, endothelial function, and blood pressure. Its priority should be high.
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Fitness
Fitness
Impact
High effect
Typical dose:4000–8000 mg
Citrulline is more effective at increasing blood arginine levels than taking arginine itself due to better bioavailability. The resulting increase in nitric oxide (NO) widens blood vessels, which can improve endurance, increase the 'pump' during workouts, and facilitate faster recovery.
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Heart Health
Heart Health
Impact
High effect
Typical dose:2000–6000 mg
Unlike Arginine, which is heavily metabolized by the liver, Citrulline bypasses this process and is converted to Arginine in the kidneys, making it a more bioavailable precursor for NO synthesis. This sustained increase in NO improves endothelial function and vasodilation.
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Muscle Gain
Muscle Gain
Impact
High effect
Typical dose:3–8 g
Improved blood flow can lead to better performance and a more significant 'pump' during workouts. It may also aid in recovery by reducing delayed onset muscle soreness (DOMS).
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Weight Gain
Weight Gain
Impact
High effect
Typical dose:4–8 g
Citrulline is a precursor to Arginine and is more effective at increasing blood Arginine levels than supplementing with Arginine itself. This leads to increased nitric oxide (NO) production, which widens blood vessels. The resulting improvements in circulation can enhance the 'pump' during workouts, support endurance, and facilitate better recovery.
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Interactions

Positive Interactions

Arginine
Citrulline is converted to Arginine in the body, boosting overall nitric oxide production when taken together, enhancing blood flow and performance.
Arginine Alpha Ketoglutarate
By increasing Arginine levels, Citrulline can augment the nitric oxide boosting effects of AAKG, further supporting vasodilation and muscle pumps.
Creatine
Citrulline's improved blood flow can enhance nutrient delivery to muscles, complementing Creatine's role in energy production and supporting overall exercise performance.
L-Carnitine
Citrulline's benefits in circulation can enhance the delivery of L-Carnitine to tissues, supporting its role in energy metabolism and fatty acid transport.
Acetyl L-Carnitine
Citrulline's improved blood flow can enhance the delivery of Acetyl L-Carnitine to target tissues, supporting its roles in cognitive function and energy metabolism.
Coenzyme Q-10
Both support cardiovascular health; Citrulline improves blood flow while CoQ10 provides antioxidant support and aids in cellular energy production, creating a synergistic effect.
Magnesium
Magnesium supports muscle function and relaxation, while Citrulline improves blood flow to muscles, potentially enhancing performance and recovery synergistically.
Vitamin C
Vitamin C is an antioxidant that can protect nitric oxide from degradation, potentially prolonging and enhancing the vasodilatory effects mediated by Citrulline.
Folate
Folate is involved in nitric oxide synthesis and metabolism, and adequate levels can support the pathway that Citrulline influences to produce NO.

Negative Interactions

Hawthorn
Hawthorn can have blood pressure-lowering effects. Combining with Citrulline, which also promotes vasodilation and can lower blood pressure, might lead to an excessive drop in blood pressure.
Omega-3
Omega-3 fatty acids can have mild blood pressure-lowering effects. Combining with Citrulline may lead to an additive hypotensive effect, especially in individuals prone to low blood pressure.
EPA (Eicosapentaenoic Acid)
EPA can have mild blood pressure-lowering effects. Combining with Citrulline may lead to an additive hypotensive effect, especially in individuals prone to low blood pressure.
DHA
DHA can have mild blood pressure-lowering effects. Combining with Citrulline may lead to an additive hypotensive effect, especially in individuals prone to low blood pressure.
Fish Oil
Fish Oil, containing Omega-3s, can have mild blood pressure-lowering effects. Combining with Citrulline may lead to an additive hypotensive effect, especially in individuals prone to low blood pressure.
Product stats
Price per product
Average$25.71
Median$24.99
Price per serving
Average$0.19
Median$0.14
Price per 100 mg
Average$0.07
Median$0.05
Price distribution
Price per serving distribution
Price per 100 mg
Reference amount: 100 mg
Paired ingredients
Ingredient forms
Citrulline Malate (1)88
L-Citrulline Malate combines the amino acid L-citrulline with malic acid (malate) in varying ratios (e.g., 2:1 or 1:1). L-citrulline is a precursor to nitric oxide, which helps dilate blood vessels, improving blood flow and nutrient delivery to muscles. Malate, a tricarboxylic acid cycle intermediate, is thought to further enhance energy production and lactic acid buffering, contributing to improved endurance and reduced muscle soreness.
Pros
  • Significantly enhances nitric oxide production, improving blood flow.
  • Proven to boost exercise performance and endurance.
  • Helps reduce muscle soreness and fatigue post-exercise.
  • Supports overall cardiovascular health.
  • Malate component may contribute to energy metabolism.
Cons
  • High doses can sometimes lead to mild gastrointestinal discomfort (e.g., nausea, diarrhea).
  • Requires relatively high dosages (typically 6-8g of 2:1 CM) for optimal effects.
  • Taste can be tart, especially in unflavored powders.
Per product
Avg$51.00
Med$51.00
Per serving
Avg$1.70
Med$1.70
Per 100 mg
Avg$0.24
Med$0.24
Price distribution
L-Citrulline Malate (1)88
L-Citrulline Malate combines the amino acid L-citrulline with malic acid (malate) in varying ratios (e.g., 2:1 or 1:1). L-citrulline is a precursor to nitric oxide, which helps dilate blood vessels, improving blood flow and nutrient delivery to muscles. Malate, a tricarboxylic acid cycle intermediate, is thought to further enhance energy production and lactic acid buffering, contributing to improved endurance and reduced muscle soreness.
Pros
  • Significantly enhances nitric oxide production, improving blood flow.
  • Proven to boost exercise performance and endurance.
  • Helps reduce muscle soreness and fatigue post-exercise.
  • Supports overall cardiovascular health.
  • Malate component may contribute to energy metabolism.
Cons
  • High doses can sometimes lead to mild gastrointestinal discomfort (e.g., nausea, diarrhea).
  • Requires relatively high dosages (typically 6-8g of 2:1 CM) for optimal effects.
  • Taste can be tart, especially in unflavored powders.
Per product
Avg$34.99
Med$34.99
Per serving
Avg$1.16
Med$1.16
Per 10 mg
Avg$0.46
Med$0.46
Price distribution