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September 10, 2026

Creatine: What It Actually Does (And Doesn't)

Creatine is probably the single most-asked-about supplement I get, and also one of the most misunderstood. Half the gym still half-believes it wrecks your kidneys. The other half treats it like a magic muscle switch you can flip without doing anything else. Neither is true. Here's what the actual research says, no hype, no scare tactics.

The safety question is already settled

This is the most studied supplement in all of sports nutrition, not close. The International Society of Sports Nutrition's official position statement reviewed the full body of evidence, including long-term use at doses up to 30 grams a day for 5 years, and found no compelling evidence of harm in healthy people [1]. The kidney-damage fear that still floats around gyms doesn't hold up against the actual data. If you're healthy, this isn't the part of your supplement stack you need to worry about.

Does it actually build muscle?

Yes, and it's not just water weight. A meta-analysis looking specifically at directly-measured muscle growth, using real imaging, not just scale weight, found creatine combined with resistance training produced a real, meaningful additive effect on muscle hypertrophy beyond training alone [2]. It's not replacing your training, it's stacking on top of it.

It's not a supplement that works by itself

Here's the part people get wrong most often: creatine isn't a substitute for training, it's an amplifier of it. A study directly comparing creatine's effect on lean body mass with and without resistance training found creatine alone, with no training stimulus, was largely ineffective for building lean mass [3]. The benefit shows up specifically when you pair it with lifting. Taking it and doing nothing else isn't going to do much for you.

Where the strength benefit shows up, and where it doesn't

This is the most useful nuance, and it rarely gets mentioned. A meta-analysis of 69 studies (nearly 2,000 participants) found creatine plus resistance training produced small but real strength gains in bench press and squat, plus improved vertical jump and short-burst power output. But it showed no significant benefit for handgrip strength or leg press specifically [4]. The effect was also stronger in younger lifters than older ones, and stronger in men than women for several of the measured outcomes.

That doesn't mean it's useless outside those specific numbers, it means the benefit isn't a flat, uniform boost across every lift and every person. It shows up most clearly in compound barbell lifts, explosive power output, younger lifters, and men, based on what's actually been measured so far.

The bottom line

Creatine is safe, it's one of the few supplements with an actual, measurable effect on muscle growth and strength, and none of that happens without you also doing the training. Not a shortcut. Just one of the small number of supplements that's actually earned its reputation.

If you want to see the studies behind everything above, they're in the Research Library.

References

  1. Kreider, R. B., Kalman, D. S., Antonio, J., Ziegenfuss, T. N., Wildman, R., Collins, R., Candow, D. G., Kleiner, S. M., Almada, A. L., & Lopez, H. L. (2017). International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. Journal of the International Society of Sports Nutrition, 14(1), 18.
  2. Burke, R., Piñero, A., Coleman, M., Mohan, A., Sapuppo, M., Augustin, F., Aragon, A. A., Candow, D. G., Forbes, S. C., Swinton, P., & Schoenfeld, B. J. (2023). The Effects of Creatine Supplementation Combined with Resistance Training on Regional Measures of Muscle Hypertrophy: A Systematic Review with Meta-Analysis. Nutrients, 15(9), 2116.
  3. Desai, I., Pandit, A., Smith-Ryan, A. E., Simar, D., Candow, D. G., Kaakoush, N. O., & Hagstrom, A. D. (2025). The Effect of Creatine Supplementation on Lean Body Mass with and Without Resistance Training. Nutrients, 17(6), 1081.
  4. Kazeminasab, F., Kerchi, A. B., Sharafifard, F., Zarreh, M., Forbes, S. C., Camera, D. M., et al. (2025). The Effects of Creatine Supplementation on Upper- and Lower-Body Strength and Power: A Systematic Review and Meta-Analysis. Nutrients, 17(17), 2748.

Full details and direct links for all four are in the Research Library.