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Creatine
- is the most popular nutritional supplement, accounting for $400 million in sales annually
- a nonessential amino acid
- has been shown to improve performance in short, high intensity exercises, including weight lifting
Adverse effects: weight gain, edema, GI cramping, fatigue and diarrhea
References
Dandoy C, Gereige RS. Performance-Enhancing Drugs. Pediatrics in Review June 2012;33(6):265-72.