Thanx for the response guys, I would love to run the Cytomel for 6 weeks, but I have just read articles saying that if you run it over 3-4 weeks you will have perm thyroid shut down, and then I read that you can run it for as long as you want with no problems if you ramp up and down, can you guys shed the light on the truth? I agree 4 weeks seems to short.