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nevermind....found your answer
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A: Again, "best" is a relative term. Find one that works best for you. It might be a trial-and-error process. To answer your second question, only if you use them stupidly. Problem with stimulants and thermogenesis is that you're creating an artificial boost of your ****bolism. This could have a negative re-bound effect. Kind of like when you're on life support too long and your lungs can no longer breathe on their own. So use them to get where you want to go, then stay there by being disciplined. Caffeine (which is the stimulant in MOST fat-burners, and the ones without stimulants usually don't work), will NOT kill you. Abuse of caffeine however, could lead to heart and blood-pressure problems. If you use a thermogenic, and a particularly strong one, don't drink soda and coffee all day.
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