Citrulline Malate
Guides, research reviews, comparisons, product recommendations and FAQs for citrulline malate.
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Start with Citrulline Malate
What the Research Says
Frequently Asked Questions
What is the difference between L-citrulline and citrulline malate?
L-citrulline is the amino acid alone. Citrulline malate combines citrulline with malic acid (2:1 ratio) — 8g citrulline malate provides ~5.3g L-citrulline + 2.7g malate. The malate component may enhance ATP production via the TCA cycle, though this benefit is harder to isolate. Most RCT data uses citrulline malate at 6–8g. For pumps alone, 6g L-citrulline equivalent works; for the combination fatigue-reduction + pump effect, citrulline malate is preferred.
When should I take citrulline malate?
30–60 minutes before training. Plasma arginine and nitric oxide precursors peak 1–2 hours after oral citrulline. Unlike caffeine, timing flexibility is acceptable — the window is broad enough that 30–90 minutes pre-workout all produce similar effects. It's also effective when taken without food, though some users report mild GI discomfort on an empty stomach.
What dose of citrulline malate is effective?
The RCT showing 40% DOMS reduction used 8g citrulline malate (2:1). Performance studies use 6–8g. Most commercial pre-workouts under-dose at 1–4g — check the label. For standalone citrulline malate powder, 8g pre-workout is the evidence-backed dose. 6g L-citrulline (equivalent) produces similar NO effects if using the pure amino acid form.
Does citrulline actually increase 'the pump'?
Yes — and this is mechanistically sound, not just marketing. Citrulline raises plasma arginine → arginine is the substrate for nitric oxide synthase → NO increases → vasodilation → greater blood flow to muscle = pump. RCTs confirm significantly higher reps-to-failure, suggesting this is more than a subjective feeling. The pump also has functional significance: nutrient delivery, metabolite clearance, and mTOR activation.
Can I stack citrulline with other pre-workout ingredients?
Yes. Evidence-backed combinations: Citrulline + Beta-alanine (complementary — citrulline targets aerobic/NO pathway, BA targets muscular endurance via carnosine). Citrulline + Creatine (different mechanisms, fully compatible — creatine is phosphocreatine system, citrulline is NO/aerobic). Citrulline + Caffeine (standard pre-workout combination, no negative interaction). Avoid stacking with high-dose arginine — redundant and may cause GI issues without added benefit over citrulline alone.