Side effects: Creatine is a drug-enhancing performance supplement. Little studies done for the teens under age of 18. Side effects, especially when taking in excess: weight gain, anxiety, breathing difficulty, diarrhea, fatigue, fever, headache, kidney problems, nausea, vomiting, rash, stomach upset. Taking with other drugs: tylenol, (acetaminophen) caffeine, ephedra may increase side effect.
Answered 12/11/2015
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