This message was originally submitted as a Reply to someone else's question; but I thought it was worth posting by itself so other's could see the benefits I've personally seen when I switched from synthetic T4 Synthroid to the natural Armour Thyroid…
I can't guarantee, can only speak from experience. I've been within the same 10 lbs for the past 10 years; but since being on Armour and eating far less wheat products I have very slowly lost 6 lbs in the past 6 months - not much, but I don't exercise.
Check out the website, "Stop The Thyroid Madness". When I found this, a lightbulb went off for me. I had been on synthetic T4-only meds for 4 years and was seeing a downward slope in my health. I had about every symptom they mention on the STTM website - including the ones that say… "has your doctor tried to put you on high blood pressure meds, antidepressants, and high cholesterol meds?" I didn't succumb to these because I knew it was related to the T4 meds and my thyroid.
The Synthroid T4 med never improved any of my thyroid symptoms. My doctor kept increasing my dose but still no improvement. Instead I just saw other terrible side effects being added. My immune system got so bad I kept getting viruses all the time. If I was around anyone sick, I got sick.
Since switching from Synthroid to Armour (and adding iron and B12 supplements and eating far less wheat products), my immune system has improved, I don't have the body aches, I don't have sharp pains in my hip which was making it difficult to walk, I have tons of energy and don't need a nap at Noon time or need to be in bed by 7pm. My head is clearer - far less brain fog. I have more ambition and motivation to work. My periods are becoming less severe each month. My weight and eating habits are far easier to manage. I'm sleeping much better and through the night. My mom who just made the change a month ago, saw immediate changes too - mainly no more legs cramps and being able to sleep thru the night.
I'm only 47. The T4 meds made me feel 70. I'm feeling my age again and actually better than I've felt in 10 years!