Comment by kherud

Feedback about creatine often seems mixed. Many love it, but many also report problems. Just in this thread there are people talking about heart palpitations and sleep problems. I have the theory that these side effects and mixed experiences come from impurities of lesser quality products. Apparently there are mostly two sources: Creatine mono-hydrate which mostly comes from China and "creapure", which is a patented formula known for its purity. Does anyone have insight into how substantiated this theory is? How likely are negative effects because of pollutants/impurities?