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Creatine – Effects, Dosage and Safety

Creatine is a naturally occurring substance that supplies muscles with rapid energy. It is widely used as a dietary supplement to enhance athletic performance and support muscle growth.

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Things worth knowing about "Creatine"

Creatine is a naturally occurring substance that supplies muscles with rapid energy. It is widely used as a dietary supplement to enhance athletic performance and support muscle growth.

What is Creatine?

Creatine is a naturally occurring nitrogenous organic acid found in the human body. It is primarily synthesized in the liver, kidneys, and pancreas from the amino acids arginine, glycine, and methionine. Approximately 95 % of the body's total creatine is stored in skeletal muscle, with the remainder found in the brain, heart, and other tissues.

Biological Function and Mechanism of Action

The primary role of creatine is to serve as a rapid energy buffer in muscle cells. In the body, creatine is converted into phosphocreatine (creatine phosphate), which acts as a high-speed reservoir for regenerating ATP (adenosine triphosphate) – the universal energy currency of the cell. This process is critical during short, high-intensity activities such as sprinting or heavy resistance training.

Creatine + ADP → phosphocreatine donates a phosphate group → ATP is regenerated
This allows cells to sustain anaerobic energy production for longer periods
Creatine may also exert anti-inflammatory and neuroprotective effects

Dietary Sources

Creatine is found naturally in animal-based foods. The richest dietary sources include:

Meat (especially beef and pork): approximately 3–5 g of creatine per kg of raw weight
Fish (especially herring, salmon, and tuna): approximately 3–4.5 g per kg
Poultry: approximately 3–3.5 g per kg

Vegans and vegetarians consume little to no dietary creatine and therefore tend to have lower muscle creatine stores compared to omnivores.

Creatine as a Dietary Supplement

Creatine monohydrate is the most widely used and extensively researched form of creatine supplementation. It is among the best-selling sports nutrition products globally.

Areas of Use

Strength training and bodybuilding: Increasing maximal strength and lean muscle mass
Endurance and team sports: Improving repeated sprint and high-intensity interval performance
Clinical research: Investigated for use in neurodegenerative conditions (e.g., Parkinson's disease, muscular dystrophy), heart failure, and depressive disorders

Dosage Guidelines

The most common dosing strategies are:

Loading phase: 20 g per day divided into 4 equal doses for 5–7 days to rapidly saturate muscle stores
Maintenance phase: 3–5 g per day on an ongoing basis
Without loading: 3–5 g daily over 3–4 weeks achieves the same saturation, but more gradually

Taking creatine together with carbohydrates or protein may enhance its uptake into muscle cells.

Efficacy and Scientific Evidence

Creatine monohydrate is one of the most thoroughly studied dietary supplements available. Numerous meta-analyses and clinical trials confirm:

Significant improvements in strength and performance during short-duration, high-intensity exercise
Support for muscle mass gains when combined with resistance training
Potential improvements in cognitive function, particularly under conditions of sleep deprivation or in older adults
Possible benefits for rehabilitation following injury or surgery

Safety and Side Effects

Creatine is considered safe for healthy adults. The most commonly reported side effect is weight gain due to increased water retention within muscle tissue. Other possible effects include:

Mild gastrointestinal discomfort when large single doses are taken
Elevated serum creatinine levels (not indicative of kidney damage in healthy individuals)
Individuals with pre-existing kidney disease should consult a physician before use

Long-term studies lasting up to 5 years have found no adverse effects on kidney function in healthy individuals.

Recommendations from Official Bodies

The International Society of Sports Nutrition (ISSN) classifies creatine monohydrate as the most effective and safest sports nutrition supplement currently available. The European Food Safety Authority (EFSA) has approved specific health claims relating creatine to improved exercise performance.

References

Kreider RB et al. - 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, 2017.
Buford TW et al. - International Society of Sports Nutrition position stand: creatine supplementation and exercise. Journal of the International Society of Sports Nutrition, 2007.
EFSA Panel on Dietetic Products, Nutrition and Allergies - Scientific Opinion on the substantiation of health claims related to creatine. EFSA Journal, 2011.

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