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Citrulline Malate – The Superior Pump and Endurance Booster
Citrulline malate is the compound of the amino acid L-citrulline and malic acid (malate). It surpasses L-arginine in its ability to increase nitric oxide levels, reduces ammonia accumulation during exercise, and has been proven to improve endurance and muscle performance – one of the most well-documented pre-workout ingredients.
Biochemical Mechanism of Action: The Urea Cycle and NO Synthesis
Citrulline is a non-proteinogenic amino acid and part of the urea cycle:
- L-Citrulline + Aspartate → Argininosuccinate → L-Arginine + Fumarate (urea cycle)
- L-Arginine → L-Citrulline + NO (via NO synthase; eNOS, nNOS)
- NO → Guanylate cyclase → cGMP → Vasodilation → Muscle pump and better oxygen supply
Why is Citrulline better than Arginine? Orally administered L-arginine is largely broken down in the intestines and liver by arginase before it reaches the muscles and blood vessels. L-citrulline bypasses this first-pass metabolism and increases plasma arginine levels even more effectively than arginine itself.
The Role of Malate
Malate (malic acid) is an intermediate product of the citric acid cycle and increases aerobic ATP production. Additionally:
- Buffers ammonia (which is produced during protein catabolism under stress)
- Improves lactate buffering
- Increases the efficiency of the respiratory chain
Performance Effects with Study Evidence
| Effect | Study Result | Dose |
|---|---|---|
| Endurance (repetitions to failure) | +52% more repetitions after 8 sets of bench press (Pérez-Guisado, 2010) | 8 g CM |
| Muscle soreness (DOMS) | Significantly reduced muscle soreness 24h and 48h post-workout | 8 g CM |
| VO2max / Endurance performance | Improved oxygen uptake efficiency | 6–8 g CM |
| Blood flow (Pump) | Increased plasma arginine and NO levels | 3–6 g CM |
| Recovery | Faster ATP resynthesis after exercise | 6 g CM |
Dosage and Timing
| Purpose | Recommended Dose | Timing |
|---|---|---|
| Pre-Workout (general) | 6–8 g Citrulline Malate (2:1) | 30–60 min before training |
| Maximum Pump | 8 g | 45 min before training, on an empty stomach or with a light meal |
| Endurance focus | 8–10 g | 30–45 min before competition |
Note: Citrulline Malate 2:1 contains 2 parts citrulline to 1 part malate. 8 g of citrulline malate is equivalent to ~5.3 g of pure citrulline. For pure L-citrulline, 3–5 g is recommended.
Frequently Asked Questions (FAQ)
Is Citrulline Malate safe for everyone?
Yes, very well tolerated at recommended doses. Occasionally GI discomfort at high doses on an empty stomach. For low blood pressure: nitric oxide-mediated vasodilation can further lower blood pressure – use with caution.
Citrulline Malate vs. L-Citrulline – which to take?
For endurance and recovery: Citrulline Malate (malate brings additional energy benefits). For pure pump/NO boost: L-Citrulline. Many pre-workouts combine both.
When does Citrulline Malate take effect?
First effects noticeable after 60–90 minutes. Optimal plasma arginine increase after 60–90 min. Therefore, take at least 45 min before training.
