L-Citrulline Malate (2:1)
L-Citrulline Malate is an amino acid compound that converts to L-arginine in the kidneys, increasing nitric oxide synthase activity. It enhances blood flow, reduces muscle soreness by up to 40%, and improves exercise performance through increased ATP production.
Origin & History
L-Citrulline Malate is a compound made from the amino acid citrulline and malic acid, often derived from watermelon and apples.
Historical & Cultural Context
Citrulline is naturally found in watermelon, which has been consumed for its health benefits across various cultures.
Health Benefits
- Increases nitric oxide production, enhancing blood flow and delivering more oxygen to muscles, improving endurance. - Reduces muscle soreness by 40% post-exercise, aiding in quicker recovery and readiness for the next workout. - Boosts ATP production, providing more cellular energy for high-intensity workouts. - Enhances nutrient delivery to muscles, supporting growth and repair through improved circulation. - Increases exercise capacity by delaying the onset of fatigue, allowing for longer and more intense training sessions. - Supports cardiovascular health by improving endothelial function, which can lower blood pressure. - Enhances ammonia clearance, reducing muscle fatigue and improving overall performance.
How It Works
L-Citrulline converts to L-arginine via argininosuccinate synthase and argininosuccinate lyase enzymes in the kidneys. Elevated L-arginine levels increase endothelial nitric oxide synthase (eNOS) activity, producing nitric oxide which activates guanylate cyclase. This creates cyclic GMP, causing vascular smooth muscle relaxation and vasodilation.
Scientific Research
Research, including RCTs, supports its role in enhancing exercise performance and reducing muscle soreness.
Clinical Summary
Randomized controlled trials with 15-41 participants show 6-8g L-Citrulline Malate taken 1 hour pre-exercise increases repetitions by 52.5% and reduces muscle soreness by 40% at 24-48 hours post-workout. A 7-day study demonstrated 18% increase in ATP production rate and 34% increase in phosphocreatine resynthesis. Evidence is moderate quality with small sample sizes but consistent findings across multiple studies.
Nutritional Profile
L-Citrulline Malate (2:1) is a compound ingredient consisting of two parts L-Citrulline bonded to one part Malic Acid by molecular ratio. It is not a significant source of macronutrients — provides negligible protein (~0g usable), fat (0g), and carbohydrates (0g) at standard dosing. Caloric contribution is minimal (~0–5 kcal per 6–8g serving). Key bioactive compounds: L-Citrulline (a non-essential amino acid, ~4g per 6g dose of the 2:1 form) acts as a precursor to L-Arginine and subsequently nitric oxide (NO) via the urea cycle; Malic Acid (~2g per 6g dose), a dicarboxylic acid and Krebs cycle intermediate that supports ATP resynthesis. No significant vitamins or minerals are present. No dietary fiber. Bioavailability: L-Citrulline Malate demonstrates superior oral bioavailability compared to free-form L-Arginine, as it bypasses first-pass hepatic metabolism and is more efficiently absorbed in the small intestine, achieving plasma L-Citrulline and L-Arginine elevations within 60–90 minutes of ingestion. The malate component enhances intestinal absorption kinetics and contributes independently to energy metabolism via the tricarboxylic acid (TCA) cycle.
Preparation & Dosage
A common dosage is 6-8 grams per day. Consult a healthcare provider before use.
Synergy & Pairings
Arginine, Beta-Alanine, Creatine
Safety & Interactions
L-Citrulline Malate is generally well-tolerated with mild gastrointestinal upset possible at doses above 10g. It may enhance effects of nitrates, PDE5 inhibitors, and blood pressure medications due to vasodilation properties. Individuals with kidney disease should use caution as citrulline metabolism occurs in kidneys. Safety during pregnancy and lactation has not been established in clinical trials.