http://www.medhelp.org/posts/show/512636?post_id=post_2877808
If you go to the link above, you will see what Dr. Lupo told Hutchi about "bio-identical" drugs.
Levothyroxine is EXACTLY the same, down to the molecular level, as the natural T4 hormone your body produces. It is bio-identical.
If someone is telling you that a compounded formula is bio-identical and Levothyroxine or any of the name brand varieties of T4 meds are artificial, they are misinformed, or misleading you.