The book 'Recovering with T3' by Paul Robinson is a key resource for understanding T3 therapy, especially for individuals with genetic mutations affecting T4 conversion.

“one of the best books on this topic it's literally like the only book just written on t3 is called recovering with t3 by paul robinson out of england he's a fellow patient is one of the only two thyroid books i recommend he found out later way later that he had the genetic mutation where he like doesn't have any of the d1d like he just he never he always suffered on t4 only his entire life until he figured it out and so that book is like was my bible almost while i was dosing and trying to figure this out”