here is a web site for synthroid take note of interactions and what can decrease effectiveness of the drug. I do have more information on fibromyalgia and I will try to glean some more information for you in the next few days. My advice would be not to take the soy, I was taking it and have hypothyroidism and feel better since I have stopped. I guess I had better paste the web site:
http://health.yahoo.com/hormone-medi...d00278a1-drugs