Secondly, I don't know what kind of thyroid problem you have, but if you take Synthroid, it is possible to use Revival (soy) with that, if you space them apart.
There are lots of other possiblilties, too, depending on your symptoms. Check out the Power Surge Recommendations Page for lots of other ideas. You can either get there by clicking that link or through the Power Surge Quick Links on the top right of any page here.
Best of luck to you and Happy Birthday!
Suzie