Creatine supplements can potentially cause side effects such as diarrhea, muscle cramps, and dehydration, even in healthy individuals. It is important to stay well-hydrated throughout the day and not exceed recommended doses. There is no zero-risk when it comes to using creatine. Long-term data on its effects are not concrete, so it is advisable to consult a nutritionist for more information. Many health insurance plans cover nutritionist services.