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Head-to-head evidence comparison — which supplement is right for you?
Beta-Alanine wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
12 of 14 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
9 of 11 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Beta-Alanine and L-Citrulline have evidence — compare verdict strength side-by-side.
3.2-6.4g daily
Anytime - timing doesn't affect carnosine buildup
CarnoSyn® sustained-release tablets
3-6g (or 6-8g citrulline malate)
30-60 minutes before exercise, Or split doses throughout day
L-Citrulline powder (pure form)
2-4 weeks
2-4 weeks
15-30 minutes post-dose
1-2 weeks
24-48 hours post-exercise
30-60 minutes
With doses >10g
Beta-alanine supplementation and exercise performance: A meta-analysis
British Journal of Sports Medicine (2017) · Meta analysis · n=1461
Significant improvement in exercise capacity
ISSN position stand: Beta-alanine
Journal of the International Society of Sports Nutrition (2015) · Review
Increases muscle carnosine by 40-80%
Effects of different dietary supplements on athletic performance in soccer players: a systematic review and network meta-analysis
Journal of the International Society of Sports Nutrition (2025) · Meta analysis
Kaempferia parviflora (SMD: 0.46, small) was associated with a significant effect on enhancing muscular strength.
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 · n=1080
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).
Meta-analysis of 1461 subjects showed 2.85% median improvement. Effect size 0.39 overall, with optimal effects at 5.6-6.4g/day. Most effective for 1-4 minute high-intensity efforts. Side effect risk primarily reflects paresthesia (tingling), which is common but harmless.
Meta-analysis showed significant reduction in muscle soreness 24h post-exercise but effect size was modest. Studies primarily used citrulline malate form.
AI-estimated from published studies. Interpret as directional guidance.
Beta-Alanine has a higher evidence score (7.5/10 vs 6/10) and wins in 3 of 3 categories.
For athletic performance, Beta-Alanine has a higher relevance score (95 vs 80).
No known interactions between Beta-Alanine and L-Citrulline have been documented in our database. However, always consult a healthcare provider before combining supplements.