in all my experience with fat burners, the only ones that make a significant enough difference that they're worth the money is eca, clen, and t3. through what i've read, i can safely assume dnp is effective as well, though from a safety standpoint, i would never encourage anyone to do dnp.

if you're going to do any fatburners, don't waste money on any "designer" fat-loss products you'll find in gnc, vitamin world, etc. most of them simply don't work, they're ridiculously overpriced considering the cost of the ingredients and worse, many just suppress the appetite, which causes a horrible rebound effect in the end. you can get clen and t3 from research labs for far cheaper than most of those hyped up fat-burners that do little to nothing, and at least with clen and t3, you know what you're putting into you.

at controlled and monitored doses, both clen and t3 are pretty safe, many would say even safer than an eca stack. for those that claim clen is so bad for you, lets not forget (if i remember correctly) that in the year 2000, 60% of all competitive athletes were prescribed clen for "excercised induced asthma". this of course was the primary reason it's no longer on the market. however, did you hear of even one case of any athlete dying cause of clen? it's not as dangerous as most think when taken responsibly.