I love how no one with experience with either T3 or T4 helps out. Someone who has used T4 should help, unless no one has.
Like I said, I have only used T3, but I will try to help with your T4 use.
It it seems that T4 will max out at 300mcg/day. I would probably taper up to 300mcg and then taper down. Maybe something like this for a 6-week plan(but remember that I don’t know what I am talking about):
Days 1,2: 60mcgs
Days 3,4: 120mcgs
Days 5-11: 240mcgs
Days 11-16 : 300mcgs
Days 17-19: 225mcgs
Days 20-22: 150mcgs
Days 23-28 : 120mcgs
Days 29-33 : 75 mcgs
Days 34-42 : 37.5mcgs
This gives a long and slow taper down, which might be best given the 7-11 day half life of T4.
Something else to think about:
“There have been a number of studies that have shown that during reduced caloric intake, and/or when carbohydrate intake is reduced dramatically, levels of deiodinase decline, hindering the conversion of T4 to the physiologically active T3(1). So, if you are dieting (which would necessarily mean you have a reduced caloric intake and/or reduced carbohydrate levels), then you have less deiodinase enzyme (still with me?) and thus, that T4 you are taking in hopes of getting it to convert to T3, is not getting converted.”-Anthony Roberts
So my advice to you: I don’t care if it is free, don’t use it. I have been given free T4 before, and I didn’t use it. If I am going to screw around with my thyroid, I am going to make sure that I get results (using T3). And that can’t be gauranteed with T4.
Note that my advice doesn’t apply if you are using GH with thyroid meds. You need to use T4 and Not T3 if you want an enhanced anabolic effect from GH. T3 will stunt the anabolic effect of GH, though not it’s fat-burning ability.