As long as the cycle is kept to under 7 days. You have enough free plasma T3 to float around for those 7 days, and the next 7 days.
After, that DNP's feed-back loop involving the T4-T3 conversion in the liver starts. Due to the extreme heat the process basically almost shuts down, and you're left with almost no Free T3 in your blood. And consequently your body temperature drops to about 35.6C (96.1F).(Sometimes less)
So, if you're cycle go past the 7 day barrier add 25-50mcg/day of T3 if on 400mg/day.(The dosage of T3 depends on your BW: <180 = 25mcgs/day >180 50mcgs/day).