It's just a basic matter of fact that T3 supplementation will suppress TSH. Most Armour prescribers know this and adjust dosage based on symptom resolution rather than TSH. Using the TSH assumes that your body is functioning normally and if you have thyroid dysfunction that's just not the case. It's like your pituitary says "Oh look--thyroid hormones! I'll just go back to sleep since obviously I don't need to do anything!" When I started replacement with 25 mcg of Synthroid that's what my gland did leaving me with less thyroid hormone than my own petering out gland was producing and causing me to gain 9 lbs. in 4 weeks.

TSH levels are one indicator of overmedication. But a better one is your free T3 and T4 levels. If those are within range, you are not overmedicated. Even if they are over range, you may not be overmedicated if you have cellular resistance to thyroid hormone or conversion issues.

Here's another site that may be of interest:

http://www.drlowe.com/QandA/askdrlowe/properuse.htm

If you're feeling good at the lower dosage, great. But if not, see if you can educate your doctor about not using the TSH as a primary indicator of overmedication. Obviously we're dealing with glands that are not functioning properly. So why should the pituitary be any more reliable than our malfunctioning thyroid?