The benefits of natural fat burners are well-known. They tend to be safer, more effective, and less harmful than synthetic ones. This is because they don't contain any artificial ingredients and have been proven to be safer for your body. One downside with natural fat burners is that they aren't as effective as synthetics. An effective fat burner should be able to make you lose weight without having to change your diet or workout routine. Natural fat burners may also cause the sensation of jitters and nausea. This is not a common side effect, but it can be uncomfortable.