Mechanism of Action of Creatine Monohydrate

Primary Mechanisms

Creatine monohydrate primarily works by increasing phosphocreatine stores within muscle cells, enhancing the rapid resynthesis of ATP and improving energy production during high-intensity exercise, as supported by the American College of Sports Medicine 1, 2
Creatine catalyzes the reversible reaction of phosphocreatine, magnesium adenosine diphosphate (MgADP-), and a hydrogen ion to MgATP2- and creatine, allowing for rapid energy production during high-intensity activities, according to the British Journal of Sports Medicine guidelines 1, 2
Supplementation increases muscle creatine stores, specifically enhancing the resynthesis of phosphocreatine, which is critical for ATP regeneration during intense exercise, as recommended by the British Journal of Sports Medicine 3

Creatine may enhance muscle protein synthesis (MPS) and inhibit muscle protein breakdown (MPB), making it beneficial for preventing muscle wasting in various clinical conditions, as suggested by the Critical Care guidelines 4, 5

Standard loading protocol involves 20g/day divided into four equal doses for 5-7 days, followed by a maintenance phase of 3-5g/day, as recommended by the British Journal of Sports Medicine 3
Lower dose approaches (2-5g/day for 28 days) can also effectively increase muscle creatine stores without the associated water retention, according to the British Journal of Sports Medicine guidelines 3
Concurrent consumption with protein and carbohydrates (approximately 50g each) may enhance muscle creatine uptake via insulin stimulation, as suggested by the British Journal of Sports Medicine 3