Head-to-head evidence comparison — which supplement is right for you?
Casein Protein wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
30-40g before bed
30-60 minutes before bed, Between meals for sustained protein
Micellar Casein powder
2-6g daily
Before exercise for fatigue reduction, Before bed for sleep support
L-Ornithine HCl
Overnight
2-4 weeks
4-8 hours
Always
During prolonged exercise
Hours post-exercise
1-2 weeks
Immediate
Effects of supplementation with milk protein on glycemic parameters: a GRADE-assessed systematic review and dose-response meta-analysis
Nutrition journal (2023) · Meta analysis · n=1851
The findings of this study suggest that supplementation with MP may improve glycemic control in adults by reducing the values of fasting insulin, FBG, and HOMA-IR.
Pre-Sleep Casein Supplementation, Metabolism, and Appetite: A Systematic Review
Nutrients (2021) · Systematic review · n=11
However, it remains unclear what the effect of this nutritional strategy is on non-muscular parameters such as metabolism and appetite in both healthy and unhealthy populations.
Pre-sleep protein ingestion to improve the skeletal muscle adaptive response to exercise training
Nutrients (2019) · Systematic review · n=387
Pre-sleep protein enhances training adaptations
Nutritional interventions for preventing and treating pressure ulcers
The Cochrane database of systematic reviews (2024) · Meta analysis · n=7920
Compared to standard diet, protein supplements may result in little to no difference in pressure ulcer incidence (protein 21 per 1000, standard diet 28 per 1000; RR 0.75, 95% CI 0.49 to 1.14; 4 studies, 4264 participants; low-certainty evidence).
Metabolomics approaches for the early detection and therapeutics: type 2 diabetes-induced diabetic kidney disease-a systematic review and meta-analysis
Metabolomics : Official journal of the Metabolomic Society (2025) · Meta analysis · n=2024
These identified metabolites hold potential as early markers for T2D-induced DKD.
Arginine, Transsulfuration, and Folic Acid Pathway Metabolomics in Chronic Obstructive Pulmonary Disease: A Systematic Review and Meta-Analysis
Cells (2023) · Meta analysis
Additionally, COPD was associated with significantly higher ADMA (SMD = 1.27, 95% CI 0.08 to 2.46, p = 0.037), SDMA (SMD = 3.94, 95% CI 0.79 to 7.08, p = 0.014), and ornithine concentrations (SMD = 0.67, 95% CI 0.13 to 1.22, p = 0.015).
Casein Protein has a higher evidence score (9/10 vs 8.5/10) and wins in 2 of 3 categories.
For speed up recovery, Casein Protein has a higher relevance score (85 vs 60).
No known interactions between Casein Protein and Ornithine have been documented in our database. However, always consult a healthcare provider before combining supplements.