Creatine monohydrate A
The most studied supplement: a consistent moderate improvement in strength and muscle gain
Citable fact
«Creatine monohydrate» — evidence level A. Dosage: 3-5 g per day continuously; a loading phase of 20 g/day (4x5 g) for 5-7 days speeds up saturation but is not mandatory. The form is monohydrate; alternative forms have shown no advantages. Source: PMID 28615996, permanent link to the source in the list below.
How it works
It increases phosphocreatine stores in muscle, accelerating ATP resynthesis during short intense efforts. It additionally increases intracellular hydration and the number of repetitions under load.
Dosage and intake
3-5 g per day continuously; a loading phase of 20 g/day (4x5 g) for 5-7 days speeds up saturation but is not mandatory. The form is monohydrate; alternative forms have shown no advantages.
The time of intake has practically no effect on the result: daily intake matters, including on rest days. It is convenient to take with carbohydrate or protein food.
Forms
Monohydrate has been studied (including in capsules and in blends). HCl, ethyl ester, nitrate and liquid forms have shown no convincing advantages.
What is confirmed
- A sustained moderate improvement in strength and power in repeated sprints and strength sets
- With strength training it adds about 1-2 kg of fat-free mass over 8-12 weeks
- A small effect on endurance due to a lower oxygen cost of work
- The effect has been reproduced in men and women, in the young and the elderly
Adverse effects and limitations
- A weight gain of 1-2 kg in the first weeks is water inside the cells, not fat
- Large doses (>10 g at a time) more often cause bloating, nausea and diarrhea
- It raises blood creatinine and may distort the assessment of kidney function without real harm
- In people with pre-existing kidney disease there are no data on long-term safety
Interactions
- Caffeine in large doses may weaken the ergogenic effect, but the data are conflicting
- Nonsteroidal anti-inflammatory and nephrotoxic drugs require caution when combined
- Diuretics and drugs affecting water and electrolyte balance increase the risk of dehydration
Who must not use it
- Under 18 years: There are few data on safety in children and adolescents; it is not recommended outside sport supervised by a physician.
- Pregnancy and lactation: Not recommended: there are insufficient data on safety during pregnancy and lactation.
- history of kidney disease
- concurrent use of nephrotoxic drugs
- significant hypertension
Sources
- International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine · Kreider RB, Kalman DS, Antonio J · Journal of the International Society of Sports Nutrition, 2017 · PMID 28615996
- Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show? · Antonio J, Candow DG, Forbes SC · Journal of the International Society of Sports Nutrition, 2021 · PMID 33557850
- Creatine Supplementation in Women's Health: A Lifespan Perspective · Smith-Ryan AE, Cabre HE, Eckerson JM · Nutrients, 2021 · PMID 33800439
- Performance-Enhancing Drugs in Healthy Athletes: An Umbrella Review of Systematic Reviews and Meta-analyses · Warrier AA, Azua EN, Kasson LB · Sports health, 2024 · PMID 37688400
See also
Comparisons
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