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Head-to-head evidence comparison — which supplement is right for you?
Whey Protein wins 2 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
Likely helps
26 of 30 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Citrulline Malate and Whey Protein have evidence — compare verdict strength side-by-side.
6-8g citrulline malate pre-workout
30-60 minutes before exercise, Empty stomach or with light carbs
Citrulline Malate 2:1 powder
20-40g per serving
Post-workout (within 2 hours), Morning, Between meals
Whey Protein Isolate
Acute (within session)
Acute
24-48 hours
Acute
4-8 weeks
24-48 hours post-workout
Immediate
Within hours of consumption
Acute Effect of Citrulline Malate on Repetition Performance During Strength Training: A Systematic Review and Meta-Analysis
International Journal of Sport Nutrition and Exercise Metabolism (2021) · Meta analysis · n=198
Small ergogenic effect (SMD=0.196)
Impact of Chronic Nitrate and Citrulline Malate Supplementation on Performance and Recovery in Spanish Professional Female Soccer Players: A Randomized Controlled Trial
Nutrients (2025) · Rct · n=60
Plasma NO3- concentrations significantly increased from baseline in the NIT + CM group and remained elevated 24 h after the final dose, confirming sustained systemic exposure.
Effects of Acute Citrulline Malate Supplementation on CrossFit(®) Exercise Performance: A Randomized, Double-Blind, Placebo-Controlled, Cross-Over Study
Nutrients (2024) · Crossover · n=21
The results indicated no significant difference in the number of rounds completed between the CM and placebo conditions (13.5 ± 5.2 vs. 13.8 ± 6.7 rounds, respectively; p = 0.587).
Comparative Efficacy of Different Protein Supplements on Muscle Mass, Strength, and Physical Indices of Sarcopenia among Community-Dwelling, Hospitalized or Institutionalized Older Adults Undergoing Resistance Training: A Network Meta-Analysis of Randomized Controlled Trials
Nutrients (2024) · Meta analysis · n=5272
Treatment effects for main outcomes were expressed as standard mean difference (SMD) with 95% confidence interval (CI).
Effects of Whey Protein, Leucine, and Vitamin D Supplementation in Patients with Sarcopenia: A Systematic Review and Meta-Analysis
Nutrients (2023) · Meta analysis · n=637
However, appendicular muscle mass significantly improved in the experimental group compared to the control group.
A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength
British Journal of Sports Medicine (2018) · Meta analysis · n=1863
Protein supplementation increases muscle mass gains
Meta-analysis showed small effect (SMD=0.196) with ~3 additional reps. Several individual studies showed mixed results including null findings. Effect appears inconsistent across different exercise modalities.
Based on multiple meta-analyses with >3000 participants. Effects require concurrent resistance training. Benefits plateau around 30-40g per serving. Isolate forms may reduce digestive issues.
AI-estimated from published studies. Interpret as directional guidance.
Whey Protein has a higher evidence score (9/10 vs 6/10) and wins in 2 of 3 categories.
For build strength & muscle, Whey Protein has a higher relevance score (95 vs 80).
No known interactions between Citrulline Malate and Whey Protein have been documented in our database. However, always consult a healthcare provider before combining supplements.