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Armour is totally safe during pregnancy. It has T4, T3, T2, and T1 in it just like humans make. Since it's from pig thyroid, the ratio of T3 in it is higher than humans usually make, but that's okay. T4 converts to T3 anyway since T3 is the active hormone. It's important to have enough T4 in you during pregnancy since that crosses the placenta more readily. However, Armour has T4 in it (about 38mcg T4 and 9 mcg T3). As long as you feel good and you try to keep your FT4 (free T4) levels in the upper end of the normal range, you're good to go. Make sure your doc looks at free thyroid levels and doesn't dose by TSH. You need to look at the actual thyroid levels rather than pituitary hormones (TSH).

Hope that helps. I own/run a thyroid board and have researched all of this to death...oh, and I'm 18 wks pregnant and on Armour. :)
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