You should NEVER take ANYTHING for the thyroid just to lose weight. That is nothing to mess with. If your thyroid is functioning properly, you could be flirting with danger. I read your other thread. You said you don't have any symptoms other than you can't lose weight. If your thyroid is OK and you take something to speed it up, you're looking for trouble! GO TO THE DOCTOR!
"Life, for all its agonies...is exciting and beautiful, amusing and artful and endearing... and whatever is to come after it-we shall not have this life again."