I did several total and free t3/t4 blood tests before taking any type of drug.
My values have always been low, below range levels.

With 150 mcg of T4, obviously EP-PSL, my blood tests say that my t3 is in range, while the t4 is slightly above the reference value.
My maintenance/replacement of the thyroid should be around 125, but with 150 mcg I'm definitely fine.

This product has fixed a problem I have had for a long time and made my life better.

I never miss it.

My wife has a slightly under-active thyroid, shes'been taking it for months and you can see the difference

One thing is for sure, you can rely on EP and PSL for the genuine article