supplementNot FDA-approvedOTC supplement
Citrulline MalateBenefits, Dosage & Interactions
Citrulline Malate is a dietary supplement often used to enhance athletic performance and support cardiovascular health. It is a combination of L-citrulline, a non-essential amino acid, and malate, a dicarboxylic acid that plays a role in the citric acid cycle.
How much Citrulline Malate do people take?
Pre-workout trials most often used 6-8 g of citrulline malate, which supplies roughly 3.5-4.5 g of L-citrulline. Route reported: Oral. Frequency reported: Once daily, typically 60 minutes before training in the performance trials. These are amounts documented in the cited studies and labels for Citrulline Malate — they are reported for reference, not a recommendation. Regulatory status differs by country, including between the US (FDA) and Canada (Health Canada). Confirm any amount with a licensed clinician before you take it.
See the full reported protocol and its sourcesResearched by DoseRoutine Research TeamReviewed for accuracy by Nicholas Alexander, RSE, SO, PMPLast updated Educational reference only — not medical advice. Always confirm dosing and safety decisions with a licensed clinician.
Evidence: Moderate — Covered by a systematic review, without regulatory approval.
Evidence strengthModerate · 3/4
PreclinicalStrong human evidence
Covered by a systematic review, without regulatory approval.
Plasma half-life
~1 h
Typical timing
before training
Food rule
on an empty stomach
Default unit
g
What published protocols report
Ranges documented in the literature, shown for reference. DoseRoutine does not recommend an amount — your prescriber or the product label sets the dose.
Reported for Citrulline Malate in the cited sources. Published ranges are not dosing advice.
References & evidence
Documents the Citrulline Malate entry is written from. Each number matches an inline marker above.
- [1]Effect of L-Citrulline Supplementation on Blood Pressure: a Systematic Review and Meta-Analysis of Clinical TrialsMirenayat MS, Moradi S, Mohammadi H, Rouhani MH · Current Hypertension Reports · 2018 · Peer-reviewed · PMID 30284051
- [2]Effects of L-citrulline supplementation on blood pressure: a systematic review and meta-analysisBarkhidarian B, Khorshidi M, Shab-Bidar S, et al. · Avicenna Journal of Phytomedicine · 2019 · Peer-reviewed · PMID 30788274
References & Evidence
Sources on this page that document Citrulline Malate dosing, timing and safety.
- [1]National Center for Biotechnology Information View source
Educational information only — not medical advice. Dose ranges vary by person, indication and prescriber.
What is Citrulline Malate studied for?
What is Citrulline Malate?Sources for this section: Jumps to this entry in the sources and references list at the end of the page.
Citrulline Malate is a dietary supplement often used to enhance athletic performance and support cardiovascular health. It is a combination of L-citrulline, a non-essential amino acid, and malate, a dicarboxylic acid that plays a role in the citric acid cycle. While L-citrulline can be found naturally in foods like watermelon, the supplemental form, particularly Citrulline Malate, is used to deliver higher concentrations for specific physiological effects. Once ingested, L-citrulline is converted to L-arginine in the kidneys, which then serves as a precursor for nitric oxide (NO) production. Nitric oxide is a potent vasodilator, meaning it helps to relax and widen blood vessels, potentially improving blood flow. The malate component is believed to support energy production, although its precise contribution in the context of Citrulline Malate's overall effects is still an area of ongoing research. It is commonly taken as a pre-workout supplement. (MedlinePlus, PubChem)
What does the research say about Citrulline Malate?
Tap a section to expand.
The primary mechanism of action for Citrulline Malate revolves around its role in nitric oxide (NO) production. Upon ingestion, L-citrulline is absorbed and transported to the kidneys, where it is efficiently converted into L-arginine. L-arginine is the direct substrate for nitric oxide synthase (NOS) enzymes, which catalyze the production of nitric oxide. Nitric oxide acts as a signaling molecule that promotes the relaxation of vascular smooth muscle, leading to vasodilation. This widening of blood vessels allows for increased blood flow, which can deliver more oxygen and nutrients to working muscles and facilitate the removal of metabolic byproducts, such as ammonia and lactate. Furthermore, L-citrulline plays a critical role in the urea cycle, an important pathway for detoxification. By facilitating the removal of ammonia, particularly during intense exercise, L-citrulline may help delay fatigue. The malate component, as a metabolic intermediate in the Krebs cycle (citric acid cycle), is believed to contribute to energy production, potentially complementing the effects of L-citrulline by supporting aerobic metabolism. However, the exact extent of malate's independent contribution to exercise performance compared to L-citrulline is still debated. (PubChem, DrugBank)
Source for this section: Sources for How does Citrulline Malate work?: Jumps to this entry in the sources and references list at the end of the page.
Citrulline Malate is primarily used for its potential benefits in exercise performance and cardiovascular health:
* **Enhanced Exercise Performance:** Many users report improvements in endurance and resistance training performance. This is attributed to increased nitric oxide production leading to better blood flow, oxygen delivery to muscles, and removal of metabolic waste products like ammonia. Some studies suggest it can reduce perceived effort and improve time to exhaustion. (Cochrane)
* **Reduced Muscle Soreness:** By facilitating the clearance of metabolic byproducts, Citrulline Malate may contribute to a reduction in post-exercise muscle soreness, particularly delayed onset muscle soreness (DOMS). (Cochrane)
* **Improved Blood Flow:** Through its conversion to L-arginine and subsequent nitric oxide synthesis, Citrulline Malate promotes vasodilation, leading to improved blood flow throughout the body. This effect has implications beyond exercise, potentially supporting overall cardiovascular health. (MedlinePlus)
* **Support for the Urea Cycle:** L-citrulline is a key intermediate in the urea cycle, which is responsible for detoxifying ammonia from the body. During intense exercise, ammonia levels can rise, contributing to fatigue. Supplementing with L-citrulline may help mitigate this by supporting efficient ammonia removal. (DrugBank)
Numerous studies have investigated the efficacy of Citrulline Malate for exercise performance. A comprehensive review by the Cochrane Library concluded that L-citrulline supplementation may have a beneficial effect on exercise performance, particularly in terms of increasing volume load and power output. However, the extent of these benefits can vary depending on the type of exercise, dosage, and training status of individuals. The review noted that more high-quality, long-term studies are needed to fully understand the long-term effects and optimal dosing strategies. Other research, often found in sports nutrition journals, supports its role in reducing muscle soreness and improving athletic performance markers in both strength training and cardiovascular exercise. The mechanism of increased nitric oxide production as a basis for improved blood flow and nutrient delivery is well-established in biochemical literature. While the malate component is theoretically beneficial for energy metabolism, direct evidence for its additive effect within the Citrulline Malate compound, specifically in human athletic performance beyond L-citrulline's effects, is less robust but consistently studied. Overall, the current body of evidence suggests Citrulline Malate is likely effective for its purported benefits, especially in the context of acute exercise performance. (Cochrane, MedlinePlus)
Citrulline Malate is generally well-tolerated at recommended doses. The most commonly reported side effects are mild and include:
* Gastrointestinal discomfort (e.g., nausea, indigestion, stomach upset, diarrhea) – more likely with higher doses or on an empty stomach.
* Heartburn.
* Rarely, some individuals might experience an allergic reaction, though this is uncommon.
Most adverse effects are transient and can often be mitigated by taking the supplement with food or reducing the dose. If you experience persistent or severe side effects, discontinue use and consult a healthcare professional immediately. This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Individuals with certain pre-existing medical conditions should exercise caution or avoid Citrulline Malate. Those taking medications for blood pressure should be particularly careful, as Citrulline Malate can lower blood pressure. Individuals with kidney disease should also consult their doctor before use, as L-citrulline is metabolized in the kidneys. Pregnant or breastfeeding women should avoid Citrulline Malate due to insufficient safety data. Always begin with a lower dose to assess tolerance. Discontinue use if adverse reactions occur. This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Citrulline Malate is generally contraindicated in individuals with a known hypersensitivity or allergy to L-citrulline or malate. Due to its vasodilatory effects, it should be used with extreme caution or avoided by individuals with very low blood pressure (hypotension) or those on medications that significantly lower blood pressure, as it could exacerbate these conditions, leading to dizziness or fainting. Individuals with severe kidney impairment should also avoid this supplement unless specifically approved and monitored by a healthcare professional, as the kidneys play a crucial role in citrulline metabolism. There is insufficient evidence for its safety during pregnancy and lactation, so it is contraindicated in these populations. This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Citrulline Malate should be used with caution, or avoided, in combination with certain medications or other supplements due to potential additive effects or interactions:
* **Blood Pressure Medications (Antihypertensives):** As Citrulline Malate can lower blood pressure by promoting vasodilation, combining it with blood pressure medications could lead to dangerously low blood pressure (hypotension). Examples include ACE inhibitors, beta-blockers, and calcium channel blockers. (MedlinePlus)
* **Nitrates (for chest pain/angina):** Medications like nitroglycerin and isosorbide are potent vasodilators. Combining them with Citrulline Malate could cause a significant and unsafe drop in blood pressure. (MedlinePlus)
* **Erectile Dysfunction Medications:** Drugs such as sildenafil (Viagra), tadalafil (Cialis), and vardenafil (Levitra) also promote vasodilation. Combining these with Citrulline Malate could lead to dangerously low blood pressure. (MedlinePlus)
* **Other supplements with blood pressure lowering effects:** Be cautious when combining with other supplements known to lower blood pressure, such as L-arginine, garlic, or fish oil, as this could lead to additive hypotensive effects. (NIH ODS)
Always consult a qualified clinician before combining Citrulline Malate with any medications or other supplements. This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Citrulline Malate is typically taken as a pre-workout supplement to maximize its benefits during exercise. For optimal absorption and to potentially reduce gastrointestinal upset, it is commonly advised to take it on an empty stomach. The half-life of L-citrulline is approximately 1 hour, meaning its effects are relatively transient. Therefore, taking it roughly 30-60 minutes before a workout allows sufficient time for absorption and conversion to L-arginine to elevate nitric oxide levels, thus promoting vasodilation and improved blood flow during the exercise session. Some individuals might split their daily dosage to maintain elevated levels, taking a portion pre-workout and another portion later in the day, though the pre-workout timing is most common for performance enhancement. For general health benefits, timing may be less critical, but adherence to a consistent schedule is important. The specific dose should be user-directed and set by a licensed clinician. (DrugBank)
Source for this section: Sources for When should you take Citrulline Malate?: Jumps to this entry in the sources and references list at the end of the page.
Put it into practice
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What interacts with Citrulline Malate?
| Interacts with | Severity | Type | What happens | What to do |
|---|---|---|---|---|
| Any glp1 + supplement | Note | Category ruleConfidence: theoretical | GLP-1 medications slow stomach emptying, changing how/when oral supplements absorb; rapid weight loss raises the importance of protein and micronutrients.Source pending | Time oral supplements when nausea is lowest; prioritize protein and micronutrients; discuss with your provider. |
| Any supplement + medication | Note | Category ruleConfidence: theoretical | Some supplements change how the body processes medications (absorption, liver enzymes, or additive effects).Source pending | Specific pairs are checked against a licensed drug database and shown with their own severity. Always confirm with your provider or pharmacist. |
Frequently asked questions about Citrulline Malate
L-citrulline is the pure amino acid. Citrulline Malate is a compound formed by binding L-citrulline with malate, a compound found in fruits like apples. While L-citrulline alone offers benefits related to nitric oxide production, the malate component in Citrulline Malate is believed by some to further enhance energy production, though this specific aspect is still an area of research. Many studies on exercise performance use the malate form.
Once ingested, L-citrulline is absorbed and converted to L-arginine and then to nitric oxide. This process can begin to show effects within 30-60 minutes of intake, which is why it's commonly taken pre-workout. The vasodilatory effects peak within a few hours.
Yes, many individuals who use Citrulline Malate for exercise performance or general cardiovascular support take it daily. As a non-essential amino acid, L-citrulline is generally well-tolerated for daily use within recommended dosages. However, it's always advisable to consult with a healthcare professional, especially if you have pre-existing health conditions or are taking other medications.
Interaction risk for Citrulline Malate comes from the rest of the stack: other supplements, prescription medicines, hormone therapy and peptides. Because Citrulline Malate is usually taken before training, most avoidable conflicts come from what else lands in that same window. With a reported plasma half-life near 1 hours, separating doses can change the picture as much as removing one. Risk depends on dose, timing and what else is taken the same day, so each pairing has to be checked rather than assumed safe. The free checker at https://doseroutine.com/interaction-checker covers Citrulline Malate with no sign-up.
Citrulline Malate is typically taken before training. Published protocols usually have it taken on an empty stomach. The reported plasma half-life is about 1 hours, which is what drives how often it is redosed. Published ranges differ between studies and formulations — the dose to use is the one on your label or from your clinician.
There is no single answer for Citrulline Malate plus TRT. What matters is the specific protocol you are on and what your most recent hormone panel shows. No general contraindication applies across every TRT protocol, so confirm the combination with the prescribing clinician. See the free TRT interaction reference: https://doseroutine.com/trt-supplement-interactions
Pairing Citrulline Malate with peptides has to be assessed one peptide at a time, because GLP-1 agonists, secretagogues, healing peptides and melanocortins do not share an interaction profile. Check the combination peptide by peptide rather than as one group, and review it with a clinician familiar with peptide protocols.
A short plasma half-life of roughly 1 hours is why protocols often split Citrulline Malate across the day rather than using a single dose. It is typically taken before training. Most protocols have it taken on an empty stomach. Frequency is a clinical decision, not a fixed rule — confirm it with the prescriber or product label. Comparison of apps that keep a schedule like this: https://doseroutine.com/best-dose-tracking-apps
Because Citrulline Malate clears quickly (plasma half-life around 1 hours), a missed dose leaves a real gap in exposure rather than being buffered by what is still in your system. Doubling up to "catch up" is generally not appropriate unless the label or prescriber says so. Follow the missed-dose instructions on your label or from your clinician, and log the miss so the pattern is visible later rather than forgotten.
For Citrulline Malate the useful record is the dose, the time it was actually taken, and what else was taken in the same window. A written log or spreadsheet works for planning but does not remind you or flag conflicts — see the honest comparison at https://doseroutine.com/vs/spreadsheet and the wider roundup at https://doseroutine.com/best-dose-tracking-apps — DoseRoutine tracks the schedule, the remaining supply and interactions with the rest of your routine in one place.
Pre-workout trials most often used 6-8 g of citrulline malate, which supplies roughly 3.5-4.5 g of L-citrulline. Route reported: Oral. Frequency reported: Once daily, typically 60 minutes before training in the performance trials. These are amounts documented in the cited studies and labels for Citrulline Malate — they are reported for reference, not a recommendation. Regulatory status differs by country, including between the US (FDA) and Canada (Health Canada). Confirm any amount with a licensed clinician before you take it.
Which studies looked at Citrulline Malate?
Peer-reviewed research indexed in PubMed. Each entry links to the original record.
- 1.A critical review of citrulline malate supplementation and exercise performance(opens PubMed in a new tab)Eur J Appl Physiol · 2021 · PMID 34417881 · https://pubmed.ncbi.nlm.nih.gov/34417881/
- 2.Effects of Citrulline Supplementation on Exercise Performance in Humans: A Review of the Current Literature(opens PubMed in a new tab)J Strength Cond Res · 2020 · PMID 31977835 · https://pubmed.ncbi.nlm.nih.gov/31977835/
- 3.Dietary Arginine and Citrulline Supplements for Cardiovascular Health and Athletic Performance: A Narrative Review(opens PubMed in a new tab)Nutrients · 2023 · PMID 36904267 · https://pubmed.ncbi.nlm.nih.gov/36904267/
Sources cited on this page
Specific documents referenced by the numbered markers above. Each number matches the marker in the text.
- PubChem CID 162762(opens in a new tab)National Center for Biotechnology Information · pubchem.ncbi.nlm.nih.gov/compound/162762
Verify at
Publisher search links for Citrulline Malate. These are places to check the information — they are not citations, so they are not numbered.
- NIH Office of Dietary Supplements(publisher search, opens in a new tab)National Institutes of Health · publisher search
- DrugBank(publisher search, opens in a new tab)DrugBank Online · publisher search
- Cochrane Library(publisher search, opens in a new tab)Cochrane · publisher search
- PubMed literature search(publisher search, opens in a new tab)National Library of Medicine · publisher search
- DailyMed labeling archive(publisher search, opens in a new tab)U.S. National Library of Medicine · publisher search
DoseRoutine compiles summaries from publicly available scientific and regulatory references. Always verify important decisions with a licensed clinician. How we source and review this information.
What is the short answer on Citrulline Malate?
Plain-text summary, safe to quote verbatim:
Citrulline Malate is a dietary supplement often used to enhance athletic performance and support cardiovascular health. It is a combination of L-citrulline, a non-essential amino acid, and malate, a dicarboxylic acid that plays a role in the citric acid cycle.
Source: DoseRoutine — https://doseroutine.com/library/citrulline-malate
Citrulline Malate cheat sheet
DoseRoutine cheat sheet · Supplement
Citrulline Malate
Citrulline Malate is a dietary supplement often used to enhance athletic performance and support cardiovascular health. It is a combination of L-citrulline, a non-essential amino acid, and malate, a dicarboxylic acid that plays a role in the citric acid cycle.
Evidence
Moderate
Covered by a systematic review, without regulatory approval.
Studied range
Pre-workout trials most often used 6-8 g of citrulline malate, which supplies roughly 3.5-4.5 g of L-citrulline
Route
Oral
Frequency studied
Once daily, typically 60 minutes before training in the performance trials
Half-life
~1 h
Timing
before training
With food
on an empty stomach
Storage
Cool, dry, sealed
Not FDA-approvedOTC supplementEndurance
Studied ranges, not dosing advice. Not medical advice — talk to a clinician. doseroutine.com/library/citrulline-malate
Cite this page
Using this in an article, AI answer, or research note? Please attribute:
DoseRoutine. (2026). Citrulline Malate — Overview, Benefits & Side Effects. Retrieved from https://doseroutine.com/library/citrulline-malate
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