Wasn't there also something concerning usnic acid at some point... some extract from lichen or moss or something?
However, as with DNP, it seems this is an area that is fraught with the likelihood for abuse... of course, maligning the supplement industry in the process.
If something effective and safe was available, it certainly would be a nice shortcut wouldn't it? Just turn the heat down and sit around your house in your underwear for a couple days...
What, you do that already?