sgale, here a very informative post in the exercise forum about thermogenics (hydroxycut). Some of us do use them, with great results. You must carefully heed all warnings and precautions, as with any supplement you take.

While Dr. Atkins does caution against caffeine, it is more YMMV issue (Your Milage May Vary). Many LC plans do not disallow caffeine. However, keep in mind that caffeine can be a reason for a stall/plateau and it is dehydrating - for every cup of caffinated beverage you must consume an extra glass of water.

HTH
Nat