Metabolic modulators are commonly known as insulin. This drug is normally used to regulate blood sugar levels in insulin dependant diabetes patients. The reason for using it in sport is due to the stimulating effect it has on energy and protein synthesis. The side effects of this drug are numerous and include sweating, hunger, dizziness, cold sweats, rapid heart rate, mood swings, blurry vision, anxiety and in extreme cases coma. If you are an insulin dependant diabetic and need insulin to function you need to complete a Therapeutic Use Exemption (TUE) form. These can be accessed by contacting your national governing body or going onto the World Anti-Doping Agency (WADA) website.