Beti ona
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Samroo is right. T4>T3 conversion goes down after a prolonged period of caloric restriction (with or without DNP). Brief explanation: T4>T3 conversion occurs mostly in peripheral tissues via D5 (deiodinase enzyme). D5 activity has been documented to go down when your dieting = less conversion of T4>T3. It's one of the metabolic adaptations the body implements in order to conserve energy. That is why, under these circumstances, a replacement dose of T3 can be justified.
This is well established within the literature and a simple "t4 t3 conversion dieting pubmed" google search will give you all the evidence you'll ever want.
As long as you're using gear, for someone "natural" who only diets, cardio, EC, and DNP, adding T3 would be a very bad idea.