Stimulants are included in weight loss supplements for a variety of reasons, but there are also several reasons to choose a stimulant-free fat burning supplement. Stimulants can have negative side effects and side effects, such as a crash after the initial energy jolt or a feeling of nervousness. In addition, there are those who are particularly sensitive to stimulants such as caffeine. Stimulant-free fat burning supplements have quickly caught up with those that contain stimulants, and there is a wide variety to try. This wide range allows the user to find the right supplement for him or her, without the risk of encountering the side effects that other supplements can cause, especially if one is sensitive.