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Creatine

amino-acid

Supplement
(15 studies)

Key Takeaways

  • Strong evidence for improving short-duration, high-intensity exercise performance at 3-5 g/day (pmid:34199588)
  • Meta-analysis shows creatine does not induce renal damage at studied doses (pmid:31375416)
  • Emerging evidence for brain health including cognition under stress and neuroprotection (pmid:35267907, pmid:33578876)
  • Females may particularly benefit due to 70-80% lower endogenous creatine stores (pmid:33800439)
  • No FDA daily value established; creatine is not classified as an essential nutrient

Evidence Spectrum

15 studies reviewed →
Strong (2)
Moderate (1)
Emerging (4)

Strength and power performance

Consistent evidence for improving maximal strength, power, sprint performance during short-duration, high-intensity activities. IOC consensus lists creatine among supplements with good evidence (pmid:29540367). Over 500 peer-reviewed publications (pmid:33557850).18111213

Muscle hypertrophy

Meta-analysis of 10 RCTs using direct imaging found a small positive effect (SMD 0.11, 95% CrI: -0.02 to 0.25) favoring creatine with resistance training. Effects in upper and lower body (0.10-0.16 cm thickness increase) (pmid:37432300).7

Brain health and cognition

Preliminary studies indicate creatine can increase brain creatine and may attenuate concussion, TBI, sleep deprivation, and depression symptoms. Optimal brain-loading protocol undetermined (pmid:35267907, pmid:33578876, pmid:39720835).259

Renal safety

Systematic review and meta-analysis found creatine did not significantly alter renal function markers. Serum creatinine may transiently rise but does not indicate renal damage (pmid:31375416, pmid:31859895).414

Womens health across lifespan

Females exhibit 70-80% lower endogenous creatine stores. Pre-menopausal females show improved strength. Post-menopausal females may benefit in muscle and bone with resistance training (pmid:33800439).3

Health and disease management

Creatine has health and therapeutic benefits throughout the lifespan, particularly when oxygen availability is compromised (pmid:33572884).6

Pediatric and adolescent use

Limited studies in adolescent athletes report ergogenic improvements with no adverse events. Therapeutic rationale for pediatric neuromuscular disorders (pmid:33670822, pmid:29059531).1011

15

Studies Reviewed

water-soluble

Solubility

Role in the Body

Creatine plays a critical role in cellular energy metabolism, particularly during high-intensity, short-duration activities. It is synthesized endogenously from arginine, glycine, and methionine, and obtained from meat and fish. About 95% is stored in skeletal muscle as phosphocreatine, which regenerates ATP (pmid:34199588). Present in the brain contributing to neural energy homeostasis with preliminary evidence for cognitive benefits under stress (pmid:35267907, pmid:33578876). Also plays roles during metabolically stressed states (pmid:33572884).

  • Rapid ATP regeneration via phosphocreatine-creatine kinase system
  • Cellular energy buffer during high-intensity exercise
  • Neural energy homeostasis in the brain
  • Potential anti-inflammatory and cell-protective effects

Supplement Forms

Creatine monohydrate

Recommended

Bioavailability: 0.99%

Gold standard. Most studied and evidence-supported (pmid:29540367, pmid:33557850)

Other forms (ethyl ester, buffered, HCl)

Bioavailability: %

No evidence of superiority over monohydrate (pmid:33557850, pmid:39720835)

Food Sources

Red meat (beef, pork)

Fish (herring, salmon, tuna)

Poultry

Deficiency

Prevalence: Not an essential nutrient; clinical deficiency not formally defined. Rare genetic creatine synthesis enzyme deficiencies exist (pmid:33572884).

Symptoms:

  • Lower muscle creatine stores (vegetarians/vegans)
  • Neurological impairment (genetic deficiency only)

Risk Factors:

  • Vegetarian/vegan diets
  • Female sex (70-80% lower stores, pmid:33800439)
  • Aging

Safety & Interactions

Possible Side Effects:

  • • Transient weight gain from water retention (pmid:33557850)
  • • Transient serum creatinine elevation (pmid:31859895)
  • • Occasional GI discomfort at loading doses

Drug Interactions:

  • • Conflicting evidence on caffeine interaction (pmid:26219105)
  • • Avoid with nephrotoxic medications (pmid:31859895)

Contraindications:

  • • Pre-existing chronic kidney disease (pmid:31859895)
  • • Concurrent nephrotoxic medication use
  • • Insufficient safety data in pregnancy (pmid:39720835)

Frequently Asked Questions

Does creatine cause kidney damage?

No. Meta-analysis found no renal damage at studied doses (pmid:31375416). It may transiently raise serum creatinine.

Is a loading phase necessary?

No. 3-5 g/day achieves saturation over 3-4 weeks. Loading (20 g/day for 5-7 days) is optional (pmid:33557850).

Is creatine monohydrate the best form?

Yes. No alternative form shown superior (pmid:33557850).

Can creatine benefit the brain?

Preliminary evidence suggests benefits for cognition under stress and concussion recovery. Optimal protocol undetermined (pmid:35267907).

Research Sources

15 peer-reviewed studies analyzed from PubMed. 14 directly cited in this review.

View All Sources
1Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show?
2Effects of Creatine Supplementation on Brain Function and Health.
3Creatine Supplementation in Women's Health: A Lifespan Perspective.