In This Article
If you can only afford one supplement, which should it be — creatine or protein? This is one of the most common questions in sports nutrition, and the answer is more nuanced than most people think.
Quick Answer
If you train hard and eat enough protein from food, creatine gives you more bang for your buck. If you struggle to hit 1.6g protein/kg/day, protein powder first. Most serious athletes benefit from both.
How They Work (Completely Differently)
⚡ CREATINE
Replenishes ATP (energy currency) in muscle cells. Works regardless of diet. Effect: more reps, heavier lifts, faster recovery between sets.
🥩 PROTEIN
Provides amino acids for muscle repair and growth. Only needed if you’re not hitting daily protein targets from food. Effect: muscle protein synthesis.
The Science: What Studies Actually Say
Creatine Evidence
Over 500 peer-reviewed studies confirm creatine’s effectiveness. A 2017 meta-analysis in the Journal of Strength and Conditioning Research found creatine supplementation increased:
- Upper body strength by +14.8%
- Lower body strength by +19.6%
- Lean body mass by +1.37 kg over placebo
- Power output by +5-15%
Protein Evidence
Protein’s role is clear: 1.6–2.2g per kg of body weight daily maximizes muscle protein synthesis (Morton et al., 2018 — largest meta-analysis with 1,800 participants). The key: if you already hit this from food, additional protein powder adds zero extra benefit.
Who Should Take What
The Bottom Line
Our Verdict
Creatine monohydrate is the highest ROI supplement in existence if you already eat enough protein. At $0.10/day for 3-5g, nothing beats it for performance. Get your protein from whole foods first — then add creatine.
Read our full evidence-based reviews: Creatine Monohydrate (9.8/10)
Top Rated Supplements
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