2,4-Dinitrophenol (DNP)

The verdict

Our read at a glance.

Whether a mitochondrial uncoupler with a documented history of fatal hyperthermia has any survivable use for fat loss.

The signal

The efficacy was never the question. DNP was sold as a weight-loss drug in the 1930s, and the historical record of that episode - a regulatory dilemma that helped shape modern drug law - is documented in the medical literature. What followed is the reason it matters here: dinitrophenol-induced cataracts, described repeatedly in the mid-century literature; systematic reviews of dinitrophenol toxicology and the management of poisoning; a case report of successful treatment of poisoning in a child; poisoning presenting as undiagnosed fever; and, recently, a clinical case report of acute dinitrophenol poisoning with a fatal outcome. The evidence base for this compound is a body count.

The unknown

There is no meaningful therapeutic window to characterise. The individual variability in response, combined with the absence of an antidote, is why toxicity is not predictable from dose alone.

Our read

This is the one memo on the Watchlist where the read is not about uncertainty. DNP does what people say it does, and it has been killing users for ninety years by the same mechanism that makes it work. There is no protocol, no bloodwork and no experience level that makes an uncontrolled uncoupler safe, and there is nothing to reverse it with once body temperature starts climbing.