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Head-to-head evidence comparison — which supplement is right for you?
L-Citrulline vs Mucuna Pruriens: L-Citrulline has the stronger overall evidence (6 vs 6/10); they're alternatives for libido & male vitality — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
L-Citrulline wins 1 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
3 of 4 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
1 of 1 studies with measurable effects showed benefit.
Top outcomes
3-6g (or 6-8g citrulline malate)
30-60 minutes before exercise, Or split doses throughout day
L-Citrulline powder (pure form)
200-500mg extract (standardized to 15-20% L-DOPA) (a typical label dose, not the dose used in the cited trials, which gave 5 g a day of whole seed powder, or single doses of 15 to 30 g in Parkinson's disease)
Morning or early afternoon, On empty stomach or with protein
Standardized extract (15-20% L-DOPA)
and 2 more not shown
1-2 weeks
24-48 hours post-exercise
30-60 minutes
With doses >10g
1-4 weeks
8-12 weeks
4-8 weeks
Absence of Effects of L-Arginine and L-Citrulline on Inflammatory Biomarkers and Oxidative Stress in Response to Physical Exercise: A Systematic Review with Meta-Analysis
Nutrients (2023) · Meta analysis
We observed no difference between pre- vs. post-exercise for oxidative stress (subtotal = -0.21 [CI: -0.56, 0.14], p = 0.24, and heterogeneity = 0%.
Effects of Citrulline or Watermelon Supplementation on Body Composition: A Systematic Review and Dose-Response Meta-Analysis
Nutrients (2025) · Meta analysis
Overall, CIT supplementation had no substantial effects on body mass index (BMI), body weight, fat mass (FM), waist circumference (WC), body fat percentage (BFP), and fat-free mass (FFM).
Effect of food sources of nitrate, polyphenols, L-arginine and L-citrulline on endurance exercise performance: a systematic review and meta-analysis of randomised controlled trials
Journal of the International Society of Sports Nutrition (2021) · Meta analysis
No effect on exercise performance following consumption of foods rich in L-citrulline was identified (SMD=-0.03, p=0.24).
Levodopa and Plant-Derived Bioactive Compounds in Parkinson's Disease: Mechanisms, Efficacy, and Future Perspectives
CNS neuroscience & therapeutics (2025) · Systematic review
Systematic review of preclinical studies and clinical trials from 2023 to 2025 comparing levodopa with plant compounds in Parkinson's disease.
Phytochemicals in Parkinson's Disease: a Pathway to Neuroprotection and Personalized Medicine
Cell biochemistry and biophysics (2025) · Review
This review provides a comprehensive overview of the neuroprotective potential of phytochemicals in PD management, examining the mechanisms underlying PD pathogenesis and emphasizing neuroprotection.
Natural angiotensin converting enzyme inhibitors: A safeguard against hypertension, respiratory distress syndrome, and chronic kidney diseases
Phytotherapy research : PTR (2023) · Review
Alkaloids, amino acids, anthocyanidins, flavonoids, glucosinolates, isoflavonoids, phenolic acids, polyphenolics, and triterpenoids are among the bioactive metabolites pocessing an impressive ACE inhibitory activity.
L-Citrulline has a higher evidence score (6/10 vs 6/10) and wins in 1 of 3 categories.
For libido & male vitality, L-Citrulline has a higher relevance score (80 vs 70).
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.