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 crashing after the initial jolt of energy or feeling jittery. In addition, there are those who are particularly sensitive to stimulants such as caffeine. Stimulant-free fat burning supplements have quickly approached the effectiveness of those containing stimulants, and there is a wide variety to try. This wide selection allows the user to find the right dietary supplement for him or her without the risk of dealing with the side effects that other dietary supplements can cause, especially if you are sensitive.