As for why footballers not taking creatine - it being unsafe is not the only possible reason 
Creatine is good for power, not for speed or stamina. Acceleration obviously requires power, but overall football involves relatively little intense anaerobic exertion so the physiological cost-benefit may not be worth it.

Creatine is good for power, not for speed or stamina. Acceleration obviously requires power, but overall football involves relatively little intense anaerobic exertion so the physiological cost-benefit may not be worth it.

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