Levothyroxine Synthroid , Unithroid,
Levoxyl and
Levothroid thyroid hormone medications are not a chemical meant to trick our system in any way. It is not toxic like other medications since it is made the same as our naturally occurring thyroid hormone. However, ATDs are another matter.
Levothyroxine, etc., is chemically identical to thyroxin (T4) in the system, and works in exactly the same way in the body, with the same effectiveness as the normally produced T4.