In place of these, there are fat burners that work without these stimulants. One of the main stimulant-free fat burners is fucoxanthin, a chemical found in seaweed and other marine plants. This is chemically similar to vitamin A and beta carotene both of which will inhibit the production of fat cells. These are just a few of the common natural fat burners. While you can get these things from natural sources, many reputable fat burner supplements contain these natural ingredients among other things.