Methylburn is one product that is not recommended for use over long periods of time. Actually, the instruction for the use of Methylburn is not more than eight weeks. First of all, it contains caffeine. Just like any other products that contain caffeine, some of the major Methylburn side effects include sleeplessness, increase in blood pressure, nausea, headaches, diarrhea and shortness of breath in some cases.
Because the ingredients of Methylburn come in proprietary blend, you can not tell exactly how much of each ingredient is present in the product.