Fat Burners/Thermogenics These are a favorite amongst bodybuilding and fitness enthusiasts because of their high potency and effectiveness. They generally include a multi-facetted formula that attacks fat from many angles. All-in-One Thermogenics usually have the great metabolism boosting ECA stack combined with appetite suppressants and other ingredients like chromium that increase fat burning. These products are the most effective, but also have the cost of associated side effects if you're sensitive to the stimulants. For some people these products are great, while others prefer stimulant free alternatives. Everyone's results are different, but you can count on at least losing a good ten, maybe fifteen pounds on these. Some people lose less, while others can lose a lot more.