I was reading up today and found a post that stated 3-4 week DNP cycle.
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So, has anyone ever tried a cycle of 3 weeks or more?
I've run low dose cycles for 3-4 weeks. There's no reason you need to keep your cycles short. In the original clinical research, people were kept on DNP for months at a time to over a year, with long-term results. Since the body develops a slight tolerance to DNP, the dose was slowly increased, as needed, to keep weight loss humming along. It doesn't take much DNP to accomplish this. They (Cutting, Tainter, Simkins) usually used 75mg jumps in the clinical research.
The reason shorter cycles are so popular nowadays is because guys typically run high-dose inferno cycles. These necessitate a psychological break, if nothing else, after a couple of weeks. But cycles like this are a poor way to run it, IMO, especially since it's much more dangerous. I've always espoused longer, low-dose cycles, for as long as you need to reach your goals.
Even at lower dosages, you might choose to use DNP cyclically. You might discontinue use every few weeks for a psychological break or maybe as part of an anabolic phase in which you focus on building muscle, like with the UD2.0. I saw that XxCrisisxX likes to run it this way. Whatever the reason, you can start back up on the DNP as soon as you want to. The only reason I'd see someone waiting is if he wanted to ration his DNP, resuming use only after his sensitivity to the drug had been reestablished. In his extensive 1937 research, Simkins said "Tolerance to the drug is established rapidly, so that to produce a consistent loss of weight the dosage must gradually be raised. On the other hand, the acquired tolerance is rapidly lost if the drug is discontinued for as short a period as two weeks. The dinitrophenol may then be resumed at a lower dosage level with its original effect on the patient. It is remarkable how sensitive many patients are to a slight increase in the dosage." Considering it doesn't take much DNP to overcome any tolerance, I'd just stay on a low dose, increasing it as needed, until you reach your goals.
Hope that helps,
Conciliator