I have done a pct of sorts for t3 but its not needed. Your t3 levels should be back up in about a week. You can use glucosamine sulfate from walmart, its been shown in studies to boost overall thyroid levels. Also I think the link blondie posted is a thyroid booster not t3, and if you want to use a thyroid booster after t3 usage like this you can. From my understanding t4 can convert to t3 and your body has ample amounts of t4. So when you have a drop off of t3 (getting off t3) you body will convert t4 to t3 and start producing more t4