Creatine monohydrate: effectiveness, dosage and safety in athletes

Creatine monohydrate is one of the most studied dietary supplements in the field of sports. Its effects on physical performance during short, intense exercise have been documented by many years of research [1][2].

How does creatine work?

Creatine is naturally produced by the liver, kidneys, and pancreas from the amino acids glycine, arginine, and methionine. Stored in the muscles as phosphocreatine, it allows for the rapid regeneration of ATP, the immediate source of energy for intense muscle contractions [3].

What are the studied benefits?

• Improvement in performance during brief, intense, repeated exercise [4]
• Reported effects in bodybuilding, sprinting, and power sports [5] — less useful in pure endurance sports
• Increase in lean muscle mass associated with intracellular water retention in the first few weeks [6]
• Support for muscle recovery after exercise [7]

Typical dosage

Option 1 – with loading phase:
20 g/day (in 4 doses of 5 g) for 5 to 7 days, then 3 to 5 g/day for maintenance

Option 2 – without loading:
3 to 5 g/day directly, saturation effect reached after about 3 to 4 weeks

Both approaches lead to similar muscle saturation in the long run; the loading phase simply accelerates it [9].

Safety and side effects

In healthy individuals, available clinical trials have not demonstrated any harmful effects on kidney or liver function at recommended doses [10][11]. Individuals with pre-existing kidney conditions must seek medical advice before any supplementation.

Possible side effects:

• Bloating or digestive discomfort
• Intracellular water retention (temporary weight gain)
• Muscle cramps in cases of insufficient hydration

It is recommended to drink enough fluids during the course [12].

Practical advice

• Take creatine after training, ideally with carbohydrates or proteins [13]
• Cycle of several weeks, renewable according to goals

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• Micronized Creatine Monohydrate, 600 g (NOW Foods) — micronized form, fast absorption, no added flavor
• Creatine Platinum 100%, 200 g (MuscleTech) — pure creatine monohydrate
• Pure Creatine, 300 g (Weider) — economical size for a long-term course

Conclusion

Creatine monohydrate is a widely studied supplement for performance in short, intense exercise, with a well-documented safety profile in healthy adults at recommended doses.

Scientific references

1. Kreider RB et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation. J Int Soc Sports Nutr. 2017;14:18.
2. Rawson ES, Volek JS. Effects of creatine supplementation and resistance training on muscle strength and weightlifting performance. J Strength Cond Res. 2003.
3. Persky AM, Brazeau GA. Clinical pharmacology of the dietary supplement creatine monohydrate. Clin Pharmacokinet. 2001.
4. Branch JD. Effect of creatine supplementation on body composition and performance: a meta-analysis. Int J Sport Nutr Exerc Metab. 2003.
5. Chilibeck PD et al.
6. Candow DG et al.
7. Buford TW et al. International Society of Sports Nutrition position stand: creatine supplementation and exercise. J Int Soc Sports Nutr. 2007.
8. Santos RV et al.
9. Greenhaff PL. The nutritional biochemistry of creatine. J Nutr Biochem. 1997.
10. Poortmans JR, Francaux M. Adverse effects of creatine supplementation: fact or fiction? Sports Med. 2000. (related reference)
11. Gualano B et al. In sickness and in health: the widespread application of creatine supplementation. Amino Acids / Eur J Appl Physiol. 2012.
12. Ziegenfuss TN et al.
13. Steenge GR et al. Protein- and carbohydrate-induced augmentation of whole body creatine retention in humans. J Appl Physiol. 2000.

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