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Citrulline Malate supplement
Amino Acid / Performance

Citrulline Malate: Benefits, Dosage, Forms & Research

Amino Acid / Performance

This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer

TL;DR — Quick Answer

Citrulline malate at 6-8 g (taken 40-60 minutes pre-workout) has been shown to increase repetitions to failure by 19-53% in resistance training (Pérez-Guisado & Jakeman, 2010) and reduce muscle soreness by 40% at 24-48 hours post-exercise. It raises plasma arginine more effectively than arginine supplementation itself.

Key Facts

What it is
L-citrulline bonded with malic acid, acting as a nitric oxide precursor and TCA cycle intermediate
Primary benefits
  • Increases training volume and reps to failure
  • Reduces post-exercise muscle soreness
  • Enhances blood flow via nitric oxide production
  • Supports aerobic energy production via malate
Typical dosage
6-8 g citrulline malate (2:1) pre-workout
Evidence level
Strong
Safety profile
Generally Safe

What the Research Says

Citrulline malate is one of the most evidence-backed pre-workout ingredients. The landmark Pérez-Guisado & Jakeman (2010) RCT in the Journal of Strength and Conditioning Research demonstrated dramatic improvements in resistance training performance and recovery. Mechanistically, citrulline bypasses hepatic arginase (unlike oral arginine), resulting in superior plasma arginine and NO elevation. The malate moiety may independently support aerobic metabolism by serving as a TCA cycle intermediate, though this mechanism is less thoroughly studied in isolation.

Benefits of Citrulline Malate

  • Training volume — Pérez-Guisado & Jakeman (2010) found 8 g citrulline malate increased upper-body reps to failure by 52.9% and reduced muscle soreness by 40% at 24 and 48 hours post-exercise
  • Nitric oxide production — citrulline raises plasma arginine and NO levels more effectively than equivalent doses of L-arginine due to bypassing hepatic first-pass metabolism (Schwedhelm et al., 2008)
  • Aerobic performance — Suzuki et al. (2016) showed citrulline supplementation improved cycling time trial performance and increased plasma NO metabolites
  • Muscle soreness reduction — multiple RCTs confirm 30-40% reduction in delayed-onset muscle soreness (DOMS) with pre-exercise citrulline malate dosing
Did you know?

Citrulline malate is one of the most evidence-backed pre-workout ingredients.

Forms of Citrulline Malate

FormBioavailabilityBest For
Citrulline Malate 2:1HighPre-workout — most researched ratio; provides ~4 g citrulline + ~2 g malate per 6 g dose
Pure L-CitrullineHighHigher citrulline per gram — 3-6 g pure citrulline equivalent to 6-8 g citrulline malate
Citrulline Malate 1:1HighEqual ratio — less common, fewer studies; higher malate proportion

Dosage Recommendations

General recommendation: 6-8 g citrulline malate (2:1 ratio) taken 40-60 minutes before exercise

Timing: Take 40-60 minutes before exercise on an empty or light stomach

Dosage by Condition

ConditionRecommended DoseEvidence
Resistance training performance8 g pre-workoutStrong
Endurance performance6 g pre-workoutModerate
Blood pressure support3-6 g L-citrulline dailyModerate

Upper limit: 10 g citrulline malate per day; higher doses may cause GI discomfort

Side Effects and Safety

Safety profile: Generally Safe

Potential Side Effects

  • Mild GI discomfort (bloating, loose stools) at higher doses — generally well tolerated
  • Heartburn in some individuals due to the malic acid component
  • Very rare: mild headache potentially from increased NO-mediated vasodilation

Drug & Supplement Interactions

  • PDE5 inhibitors (sildenafil, tadalafil) — additive blood pressure lowering via enhanced NO pathway
  • Antihypertensive medications — may potentiate blood pressure reduction
  • Nitrates — additive vasodilation; use caution
Check Citrulline Malate interactions with other supplements →
BenefitsDosage GuideSide EffectsTypes & FormsResearchFAQ

Related Conditions

Muscle Recovery

Related Supplements

Nitric OxideBeta-AlanineCreatine

Frequently Asked Questions

Is citrulline malate better than L-arginine for pumps?

Yes. Oral L-arginine is extensively metabolized by intestinal and hepatic arginase, meaning only a fraction reaches systemic circulation. L-citrulline bypasses this first-pass metabolism and is converted to arginine in the kidneys, resulting in significantly higher plasma arginine levels. Schwedhelm et al. (2008) confirmed citrulline supplementation raises arginine levels more than arginine itself.

What is the difference between citrulline malate and pure L-citrulline?

Citrulline malate combines L-citrulline with malic acid (typically 2:1 ratio), so 6 g provides about 4 g citrulline and 2 g malate. Pure L-citrulline provides only the amino acid. Most performance studies used citrulline malate, but pure L-citrulline at 3-6 g is similarly effective for NO production. The malate may offer minor additional aerobic benefits.

Can I take citrulline malate on rest days?

While most benefits are acute (pre-workout), some research suggests daily citrulline supplementation may support vascular health and blood pressure over time. On rest days, a lower dose of 3-4 g can be taken for general cardiovascular support, though it is not strictly necessary.

References

  1. (). Citrulline malate enhances athletic anaerobic performance and relieves muscle soreness. Journal of Strength and Conditioning Research. DOI
  2. (). Pharmacokinetic and pharmacodynamic properties of oral L-citrulline and L-arginine. British Journal of Clinical Pharmacology. DOI
  3. (). Oral L-citrulline supplementation enhances cycling time trial performance. Journal of the International Society of Sports Nutrition. DOI