Actually, from my researching, the reason that it was banned was because it was causing cataracts in women; low percentage, but nevertheless.
Anyways, there is a ton of data on this substance as being an effective weight loss drug; safe too. Check google scholar. In addition, check on the mesmorphis forums for the "how to not fuck up dnp" there is a guy out there in the forum world by the name of concillator, and he has an immense amount of knowledge on the drug as being safe and effective, along with cutting through the 'bro logic'
also, check out the sight, illegallything.com - it's a site about dnp, the guy wrote a book about the drug. it's aight, but again, something to look at.
I think the drug is amazing and extremely safe with the right dosing protocol. I mean, yeah, the ld50 is low - it's like 2 or 3 grams, but you never take more than a gram, and i never take more than 535mgs. It's like, you would never take a gram of ephedra in one day, right? the pills aren't going to magically fall in your mouth...