I have lurked here a long time and seen alot of posts regarding DNP. Never once have I heard anyone mention the side effect that ultimately got dnp pulled from the market as a weight loss aid in the 30's . DNP may eventually causes cataracts. Even if you have successfully used dnp and not died from hypothermia, you are at risk of developing cataracts from the use of this product in the future. I would suggest to anyone who has used this to see an opthamologist on a regular basis and be very careful with your use of dnp. For more information including the risk of cataracts see the Agency of Toxic Substance and Disease Registry (they are part of the CDC) website at www.atsdr.cdc.gov and go to the toxicological profiles and search for Dinitrophenols. There is some brief info in the toxfaqs for this chemical but the most information is from the entire toxicological profile, which is available in pdf format.