For several years I was tested and had to have my thyroid adjusted. Most medications were in increments of 15 mg., 30 mg. 45 mg and 60 mg. However, I needed something more specific to my individual needs. The USP 32.5 mg was exactly what I needed. It has brought my numbers in the correct range. I feel that taking anything else is going backwards to a less specific medication. I have taken other compounded thyroid medications and know that this one is best for me - a proper balance.