Fat burning products like thermogenics are scetchy at best, the same effect can be obtained by eating high ammounts of protein (suplimented with protein shakes ect if needed).
Protein is thermogenic by nature, it takes 30% more effort for your body to break it down over carbs and fats.
As for creatine, its a highly researched product, and supplimentation can even be reccomended for its effects, which amongst giving a higher workout protential include delaying or slowing the potential onset of various mental illnesses, its a very powerful antioxidant and helps prevent heart heart disease.