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There are many types of fat burners on the market, and you should be leary of using any of them without first checking out what is in them and talking it over with your doctor. Fat burners are made to help elevate your body's metabolic rate. Many of them contain ephedrine, or any number of other stimulants which can elevate blood pressure, heart rate etc. Especially be careful if you have any type of heart issues or high blood pressure, as these will only exacerbate those problems. You should make sure you know what you are taking and how it can affect you before taking it.