What is Citrulline?
Citrulline is a non-essential amino acid commonly used in sports nutrition products to support exercise performance, endurance, and blood flow. In the body, citrulline is converted to arginine, which serves as a precursor to nitric oxide (NO). Nitric oxide helps relax and widen blood vessels, supporting circulation and the delivery of oxygen and nutrients to working muscles. As a result, citrulline has become a popular ingredient in pre-workout and performance-focused supplements.
Sports nutrition products typically use either L-citrulline or citrulline malate, with both forms being widely utilized in the market. Citrulline is often included in formulations designed to support training volume, muscular endurance, exercise capacity, and the “pump” effect sought by many athletes and fitness enthusiasts. Because it works through a different mechanism than ingredients such as caffeine or creatine, citrulline is frequently used as part of comprehensive performance blends.
Common Applications
Citrulline is commonly used in:
- Pre-workout supplements
- Endurance nutrition
- Stim-free performance supplements
- Nitric oxide and pump formulas
- RTD performance beverages
Frequently Combined With
Ingredients commonly combined with citrulline are:
- Beta-Alanine
- Creatine
- Taurine
- Beetroot extract
- Caffeine
- Betaine Anhydrous
Manufacturing Considerations
Successful citrulline formulations require careful consideration of ingredient performance, consumer experience, and manufacturing requirements. Below are several key factors brands should evaluate during product development.
Manufacturers should determine with clients whether L-citrulline or citrulline malate best fits the desired application, positioning, and dosage targets.
Citrulline can impart a tart or acidic taste profile, particularly at higher inclusion levels, making flavor optimization important.
Effective use levels are often measured in grams rather than milligrams, requiring sufficient formulation space and package sizing.
Citrulline generally exhibits good stability in dry powder applications when protected from excessive moisture.
