Creatine is safe and causes few adverse side effects. There are, however, concerns over the possibility of creatine causing liver, kidney, or heart damage in high doses.
If you have liver, kidney, or heart problems, consult your doctor to see if creatine is right for you.
Some minor side effects of creatine include muscle cramps, nausea, diarrhea, heat intolerance, and dizziness. Stop taking oral creatine if adverse side effects worsen or don’t improve.
Creatine can boost your energy stores and increase your athletic performance, but it may cause some water weight gain.
Fluid retention might be temporary, or it might continue for as long as you use creatine. However, it may become less noticeable as you build lean muscle mass.