Jan 31, 2017 Any of you guys ever used this stuff? My HRT doc prefers it over T3 or T4 but never hear it discussed much (if at all) in fitness/bb circles. Since it's a natural product, each batch varies slightly and contains varying amounts of T1,T2,T3, and T4. Below is a conversion chart (on average for T3 and T4) http://centraldrugsrx.com/pdf/Thyroid_Conv...hart_08-13a.pdf "Natural" hippie bullshit propaganda? Outdated med with the advent of synthetics? Other?