https://blogs.mercola.com:443/sites/vitalvotes/archive/2004/10/02/Why-Armour-Thyroid-is-Better-Than-Synthroid.aspxMaryo Shomon reviews more research from the 2004 European Thyroid Association Annual Meeting. She heads up the top thyroid site on the net and has written a great book on the topic . Synthroid is exclusively T4 while Armour is primarily thought of asenCommunityServer 2008.5 SP1 (Debug Build: 31106.3070)