http://www.muscleperfect.com/t-complex/

T-Complex Try to use caution when using creatine. Make sure not to use these types of supplements at all if you have any type of kidney problem. Additional known complications include muscle cramps and compartment syndrome. Creatine supplements have even been linked with heart arrhythmia. Adolescents face a higher risk of these complications. Read the label and make sure that you do not take more than recommended amount.

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http://www.muscleperfect.com/t-complex/