Last year I was taking 45g. By the summer, I failed to recognize I needed to up my dose. My doctor suggested 90mg (a grain and a half), and this seems like a great dose for now. I have mine compounded by a pharmacy 60 min away (they mail it) from me that uses vitamin c as a filler. I do not trust most fillers! I've tried glutamine and cellulose and gained weight! Vitamin c is the best.
Funny story about Erfa, I used to take that 3 years ago and loved it. Then I suspected they changed the formula. I found a lot of controversy over the web about this. Hopefully there are no longer problems with it. I would love to take it again because I would save money, but I'm afraid to risk it. Please don't let this discourage you. If you try it I'd LOVE to hear how you feel on it. Why are you switching from Nature-throid?