GuideSports nutrition

L-Citrulline vs Citrulline Malate

Pre-workout labels often list citrulline malate in grams, but how much citrulline is that really? This guide explains what L-citrulline is, how to convert malate figures, amounts used in studies, medicine cautions and what research has found so far. No health claim for L-citrulline is authorised in the EU.

By the Healthana Editorial Team · Last reviewed: 01 Nov 2026

Daily reference intake (NRV)No NRV set
Upper limit for adultsNo upper limit set; see guidance below

What L-citrulline is

L-citrulline is an amino acid that your body makes as part of the urea cycle, the process that clears nitrogen. It is not used to build protein. The kidneys convert citrulline into another amino acid, arginine, which the body uses to make nitric oxide, a molecule involved in blood vessel tone. Taking citrulline by mouth raises blood arginine levels, which is why it appears in so many pre-workout formulas.

The name comes from Citrullus, the Latin name for watermelon, which is the richest food source. Research on sport performance is limited and mixed: a 2019 meta-analysis found a small effect on strength and power tasks, a 2022 meta-analysis found no significant effect on aerobic performance, and the NIH Office of Dietary Supplements describes the evidence as conflicting. No health claim for L-citrulline is authorised in the EU.

Forms you'll see on labels

FormWhat to know
L-citrullineThe pure amino acid. 1 g on the label is 1 g of citrulline.
Citrulline malate 2:1Citrulline bound to malic acid. About 57% of the weight is citrulline, so 8 g provides roughly 4.5 g of citrulline.
Citrulline malate 1:1Contains more malate and less citrulline per gram than the 2:1 form. Check the ratio before comparing products.
Citrulline DL-malateA variant name; good labels state the citrulline provided, for example 6,000 mg giving 3,300 mg citrulline.
Watermelon extract or juiceA food-based source with much smaller and more variable amounts.

How much is used

There is no NRV for citrulline and no tolerable upper intake level set by EFSA or other major authorities.

  • In studies: about 2.4–6 g of L-citrulline a day, or 8 g of citrulline malate, often taken about an hour before exercise. Some studies used a daily dose for 1–2 weeks.
  • Safety data: short-term studies report few concerns at up to 6 g a day for several weeks. Safety over months of use has not been well studied.
  • Side effects: some people report stomach discomfort, especially with larger single doses of citrulline malate.
  • Food: watermelon, especially the white rind, plus smaller amounts in cucumber, melon and other gourds.

Who should check with a doctor or pharmacist first

  • People taking blood pressure medicines, nitrates for chest pain, or erectile dysfunction medicines such as sildenafil, because citrulline raises arginine and nitric oxide production.
  • Anyone with low blood pressure, a heart condition, or kidney or liver disease.
  • Pregnant or breastfeeding women, as there is little safety data.
  • Children and teenagers: most pre-workouts are labelled for adults. Check the age on the pack and ask a doctor or pharmacist.

How to read the label

  • Citrulline or citrulline malate? This is the key question. 6 g of L-citrulline and 6 g of citrulline malate are very different amounts of citrulline.
  • Ratio: for citrulline malate, look for 2:1 or 1:1. If no ratio is given, you cannot work out the citrulline content.
  • Per serving vs per scoop: many pre-workouts state amounts for 1.5 or 2 scoops.
  • Other ingredients: citrulline is often paired with caffeine, arginine or beta-alanine. Note the caffeine per serving.
  • Servings per pack: a 200 g tub at 9 g a serving gives about 22 servings.

Compare pump and stimulant-free formulas in our pre-workout collection.

Bahrain & GCC notes

Citrulline powders clump in humidity, so keep the lid tight and add a dry scoop. If you train after iftar, a citrulline drink with water fits naturally into that window. Local watermelon in summer is a simple food source, though the amounts are much smaller than supplements. More options sit in our pre-workout range.

OLIMP Citrulline Malate, 200g
Label check

Reading a real label

OLIMP Citrulline Malate, 200g
On the labelWhat it means
8.1 g citrulline malate per 9 gThe weight of the whole compound
Provides 4.6 g L-citrullineThe figure to compare with pure citrulline
Serving = 3 scoopsRead the scoop count, not just the grams
About 30 minutes before trainingHow the label suggests using it
Figures from the product's own label. Always check the pack in your hand.See this product
EU-authorised health claims

    No health claim is authorised for this ingredient in the EU. We share facts only.

    Frequently asked questions

    How much citrulline is in citrulline malate?

    In the common 2:1 form, about 57% of the weight is citrulline, so 8 g of citrulline malate gives roughly 4.5 g of citrulline.

    Is L-citrulline the same as L-arginine?

    No. They are different amino acids, but the kidneys convert citrulline into arginine.

    When do people take citrulline?

    Studies often gave it about an hour before exercise, and some used a daily dose for one to two weeks.

    Can I take citrulline with blood pressure medicine?

    Speak to your doctor or pharmacist first, especially if you take blood pressure medicines, nitrates or sildenafil.

    Is there an authorised EU health claim for citrulline?

    No. No health claim for L-citrulline is authorised in the EU.

    Sources
    This page is general information from Healthana, not medical advice. Food supplements should not replace a varied, balanced diet and a healthy lifestyle. Speak to your doctor or pharmacist if you are pregnant or breastfeeding, take medication or have a medical condition. Editorial policy
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