Is creatine monohydrate just as good as more expensive forms?

Creatine monohydrate demonstrably improves muscle performance during short-duration, high-intensity exercise such as strength training and sprinting. It is the most thoroughly researched form of creatine, and its efficacy is not in dispute on the basis of multiple randomised trials. A loading dose accelerates saturation, but is strictly speaking not necessary.

A systematic review of 17 randomised trials compared alternatives such as creatine citrate, malate, ethyl ester, nitrate and pyruvate with monohydrate. None of those forms proved consistently superior for performance or body composition. Moreover, only three trials involved a direct head-to-head comparison, which makes firm conclusions difficult. Creatine monohydrate is also the cheapest option.

Creatine ethyl ester (CEE) stands out in a negative way. It is converted to creatinine in the gastrointestinal tract, which can cause a blood test to incorrectly suggest that the kidneys are failing. This effect does not occur with monohydrate. In addition, in a small trial in patients with a specific creatine metabolism disorder, CEE produced no measurable improvement in brain function or creatine levels in the brain after twelve months, despite earlier promising results in cell culture experiments.

At the recommended daily dose of 3 grams, creatine monohydrate is considered safe for healthy adults. Known side effects include temporary water retention and, occasionally, gastrointestinal complaints or muscle cramps. At higher doses or in combination with other supplements, cases of liver and kidney problems have been reported, so more is not automatically better. Safety data for most alternative forms are scarce, and specific concerns have been identified for some.