Creatine: What the Research Actually Says
Creatine is one of the most studied sports supplements. Here is what the evidence says about strength, muscle, safety, and who benefits most.
What is creatine?
Creatine is a compound found naturally in muscle cells. It helps produce ATP, the primary energy currency used during short, intense efforts like lifting weights or sprinting.
What does the evidence show?
Creatine monohydrate is one of the most consistently effective supplements for increasing strength and lean muscle mass when combined with resistance training. Meta-analyses report small-to-moderate effect sizes across a wide range of populations.
- Strength: Multiple randomized controlled trials show greater strength gains with creatine than placebo in resistance-training programs.
- Muscle mass: Lean body mass tends to increase modestly, especially during the first few months of training.
- Cognitive: Research in older adults and vegetarians suggests possible cognitive benefits, though the evidence is more limited than for muscle performance.
- Safety: Long-term studies in healthy adults have not found serious adverse effects at standard doses (3–5 g per day).
Who benefits most?
- People doing high-intensity, short-duration exercise.
- Vegetarians and vegans, who tend to have lower baseline creatine stores.
- Older adults looking to support muscle and function alongside training.
Practical takeaways
- Dose: 3–5 g per day of creatine monohydrate is sufficient for most people. Loading phases are optional.
- Form: Creatine monohydrate is the most studied and cost-effective form; most novel forms have no proven advantage.
- Timing: Take it consistently; timing relative to workouts is less important than daily intake.
Verdict
Creatine has strong evidence for improving strength and muscle mass during resistance training. It is generally well tolerated and inexpensive, making it one of the most reliable supplements in the evidence base.