For MK677, there is no PcT needed. For healing effects on your rabbit, have him use 20mg for 3 weeks followed by 10mg for 3 weeks. To bulk your rabbit, go 20mcg for 8 weeks, but then tapper him off. You'll see him keep all the gained affects thereafter with a 10mg dose, but also use 10 every other day to combat lethargy and make it a long "cycle". I NEVER have done a PCT with MK2867 and there are gentlemen on the boards here who rip me for it. My blood work has just never shown me needing it, and my liver count and lipids actually improve. But get blood work for your bunny to know for sure.