How to Take Citrulline Malate: Dosage, Timing, and Duration
Citrulline malate is easy to buy and easy to mix, but getting the details right makes a difference: how many grams, how long before training, and whether to take it every day or only on workout days. Our editorial team turned the published studies into a practical, no-nonsense guide.
Understanding the product on the label
Before thinking about doses, it helps to know exactly what is in the container. Products labeled "citrulline malate" combine L-citrulline with malic acid, most commonly in a 2:1 ratio and sometimes 1:1. Products labeled "L-citrulline" contain the amino acid alone.
In a 2:1 citrulline malate, about two thirds of each gram is citrulline. In a 1:1 product, only half is. This means 6 g of 2:1 citrulline malate provides about 4 g of citrulline, while 6 g of a 1:1 product provides about 3 g.
Some pre-workout formulas list "citrulline malate" within a proprietary blend without stating the amount. Under US supplement rules this is legal, but it makes dosing impossible to judge. If the dose is not disclosed, assume it may be lower than research levels.
Independent analyses have also found that some products contain less citrulline than claimed. Choosing brands with third-party certification such as NSF or Informed Sport adds confidence that what is on the label is in the scoop.
Dosage used in research
The study that put citrulline malate on the map, by Pérez-Guisado and Jakeman, used a single dose of 8 g of citrulline malate one hour before a bench press session. Participants completed more repetitions and reported less muscle soreness afterward.
Later studies used doses ranging from about 6 to 8 g of citrulline malate, or 3 to 6 g of pure L-citrulline. Meta-analyses, including the review by Trexler and colleagues, generally analyzed this range and found a small positive effect on high-intensity strength and power performance.
| Product | Typical research dose | Approximate citrulline content |
|---|---|---|
| Citrulline malate 2:1 | 6–8 g | ~4–5.3 g |
| Citrulline malate 1:1 | 6–8 g | ~3–4 g |
| Pure L-citrulline | 3–6 g | 3–6 g |
A dose-ranging study known as Citrudose found that single doses up to 15 g of citrulline were well tolerated in healthy volunteers and raised plasma arginine. However, there is no evidence that doses above the 6–8 g citrulline malate range improve performance further.
Timing before exercise
Most performance studies gave citrulline malate about 60 minutes before exercise. Pharmacokinetic studies show plasma citrulline peaks roughly one hour after oral intake, with arginine levels rising soon after, so this timing aligns with the expected window of action.
Taking it 30 to 60 minutes before training is a reasonable practical window. If you train early in the morning, mixing it with water when you wake up and then preparing for the session usually fits this timing well.
Taking citrulline after training has not been specifically shown to enhance recovery. If reduced soreness is your goal, the evidence so far relates to pre-exercise intake rather than post-exercise use.
Single dose or daily use: duration
Most strength-focused studies tested a single acute dose, while some endurance studies used daily intake for one to two weeks. For example, Suzuki and colleagues gave trained cyclists 2.4 g of L-citrulline daily for seven days and reported improved time-trial performance.
This suggests two practical approaches. For resistance training, taking citrulline malate only on training days before the session is consistent with the research. For endurance athletes, a short daily loading phase before key sessions or events may be worth testing.
- Start with a moderate dose, for example 6 g of 2:1 citrulline malate, about 60 minutes before training.
- Use it for several weeks while recording sets, reps, and perceived effort.
- Compare training logs with and without the supplement to judge personal response.
- Adjust within the research range rather than exceeding it.
There is no established need to "cycle off" citrulline. It is not known to cause tolerance in the way stimulants can, and long-term use at research doses has not raised safety concerns in healthy adults, though truly long-term data are limited.
Tolerability, combinations, and precautions
The most common side effect at higher doses is stomach discomfort. Dissolving the powder in enough water, at least 8 to 12 ounces, and avoiding very large single doses on an empty stomach usually helps. Malic acid gives the drink a sour taste, which some people mask with a small amount of juice.
Citrulline is commonly combined with caffeine, beta-alanine, and creatine. These combinations are not known to be harmful in healthy adults, but they make it harder to tell which ingredient is responsible for any effect or side effect. Caffeine in particular is often the cause of jitters or sleep problems attributed to pre-workouts.
Because citrulline can modestly lower blood pressure, people taking antihypertensive drugs, nitrates, or erectile dysfunction medications should consult a doctor. Pregnant and breastfeeding women should avoid supplementation unless advised by a physician.
Conclusions of the editorial team
Research-based doses are about 6–8 g of citrulline malate or 3–6 g of pure L-citrulline, taken around an hour before exercise.
A single pre-workout dose fits strength research, while short daily use may be relevant for endurance athletes.
Checking the ratio and the disclosed amount on the label is as important as the dose itself.
You may also find value in our articles on citrulline malate for women, on combining creatine and caffeine, and on nitrate-rich foods for performance.
References
- Pérez-Guisado J, Jakeman PM. Citrulline malate enhances athletic anaerobic performance and relieves muscle soreness. J Strength Cond Res. 2010;24(5):1215–1222.
- Trexler ET, Persky AM, Ryan ED, et al. Acute effects of citrulline supplementation on high-intensity strength and power performance: a systematic review and meta-analysis. Sports Med. 2019;49(5):707–718.
- Suzuki T, Morita M, Kobayashi Y, Kamimura A. Oral L-citrulline supplementation enhances cycling time trial performance in healthy trained men: double-blind randomized placebo-controlled 2-way crossover study. J Int Soc Sports Nutr. 2016;13:6.
- Moinard C, Nicolis I, Neveux N, et al. Dose-ranging effects of citrulline administration on plasma amino acids and hormonal patterns in healthy subjects: the Citrudose pharmacokinetic study. Br J Nutr. 2008;99(4):855–862.
- Wax B, Kavazis AN, Weldon K, Sperlak J. Effects of supplemental citrulline malate ingestion during repeated bouts of lower-body exercise in advanced weightlifters. J Strength Cond Res. 2015;29(3):786–792.
- Bendahan D, Mattei JP, Ghattas B, et al. Citrulline/malate promotes aerobic energy production in human exercising muscle. Br J Sports Med. 2002;36(4):282–289.
