L-citrulline is converted to L-arginine in the body. It increases nitric oxide which increases blood flow. People use L-citrulline to increase exercise endurance and stamina, treat erectile dysfunction and reduce fatigue.

Where can I Buy Citrulline?

Patients can Buy citrulline with an included prescription consultation with a doctor.
Clinical Formula
FDA Designation
Other Names
L-Citrulline, delta-Ureidonorvaline
For Use By
Delivery Method

Can I Buy Citrulline?

Approved patients can buy Citrulline in the Amino Blend formula with the included prescription consultation. Consult with the doctor via an online Telewellness visit. The medication is then sent directly from the pharmacy after approval.

Do We Offer Citrulline as part of a treatment plan?
Increase Endurance
Meet your workout goals
Reduce Fatigue
Increases overall energy

How Does Citrulline Work?


Citrulline is a non-essential amino acid that is produced in the body and is also found in watermelon, cucumber, squash, and pumpkin. In the body, L-citrulline is converted into L-arginine and L-ornithine. These three amino acids are part of the urea cycle which processes ammonia, a metabolic waste product. L-citrulline increases L-arginine, which increases nitric oxide. Increases in nitric oxide can increase blood flow to muscle, reducing fatigue, reducing energy expenditure, and increasing exercise endurance.

In another study, after oral supplementation with citrulline malate, participants reported reduced fatigue, a 34% increase in oxidative ATP production during exercise, and a 20% increase in phosphocreatine recovery rate after exercise. In another study, L-citrulline increased growth hormone levels, potentially due to increased arginine levels.

Benefits of Citrulline

L-citrulline increases L-arginine and nitric oxide which increases blood flow. Many of the benefits associated with L-citrulline use are a result of buffering ammonia levels and increasing blood flow. Supplementing with L-citrulline has the following potential benefits:
  • Better athletic performance
  • Improved exercise capacity
  • Reduced muscle fatigue
  • Faster post-exercise recovery
  • Improved erectile function

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Drug Details


What is Citrulline used for?

  • L-citrulline is indicated to treat:
  • Urea Cycle disorders


When should you avoid Citrulline?

  • Contraindications for prescribing or using L-citrulline include:
  • Allergy to L-citrulline or any of its components
  • Breastfeeding
  • Pregnancy
  • Liver disease
  • Kidney infection
  • May affect blood pressure
Citrulline Side Effects

What are the side effects of Citrulline?

Side effects associated with L-citrulline are rare. Reported side-effects include:
Common Citrulline Side Effects
  • Gastrointestinal upset
  • Heartburn
  • Cough
Rare Citrulline Side Effects
  • Diarrhea
  • Nausea
  • Vomiting


  • The Importance of Quality Specifications in Safety Assessments of Amino Acids: The Cases of L-Tryptophan and L-Citrulline
  • Pharmacokinetic and Pharmacodynamic Properties of Oral L-Citrulline and L-Arginine: Impact on Nitric Oxide Metabolism
  • L-Citrulline Supplementation: Impact on Cardiometabolic Health
  • Effect of L-Arginine or L-Citrulline Oral Supplementation on Blood Pressure and Right Ventricular Function in Heart Failure Patients with Preserved Ejection Fraction
  • Citrulline Malate Enhances Athletic Anaerobic Performance and Relieves Muscle Soreness
  • Oral L-Citrulline Supplementation Enhances Cycling Time Trial Performance in Healthy Trained Men: Double-Blind Randomized Placebo-Controlled 2-way Crossover Study
  • Citrulline/Malate Promotes Aerobic Energy Production in Human Exercising Muscle
  • Oral L-Citrulline Supplementation Improves Erection Hardness in Men With Mild Erectile Dysfunction
  • L-Citrulline-Malate Influence Over Branched Chain Amino Acid Utilization During Exercise
  • Effects of L-citrulline Oral Supplementation on Polymorphonuclear Neutrophils Oxidative Burst and Nitric Oxide Production After Exercise
  • L-Citrulline US FDA

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