You say less or ineffective, but comment on this:
My wife had a total thyroidectomy (thyroid fully removed) when she was about 17. So, her body is not producing any T3 or T4. Can you then explain, why it is, that she only takes 175-200mcg of T3 a day to maintain natural levels? I really doubt the safety in using T3, when simply cardio, clen and a good diet would suffice.
Blonski