I have taken Armour Thyroid, 60 mg, for 25 years. It is naturally dessicated porcine thyroid. A doctor’s prescription is required to get it in the U.S. Pretty sure it is FDA approved. But since it IS considered a natural product, neither insurance nor Medicare will cover any portion of the cost. (They only cover chemical prescriptions like Synthroid, etc.). Armour contains both T3 & T4. I believe other thyroid meds have only one or the other & doctors don’t always test to see which one you need.

I’m sure you’ve found a routine that works for thyroid med dose timing. I found that if I get up to go to the bathroom around of after 3am I just go ahead and take my thyroid med THEN. So, when I wake up enough time has passed that I can eat/drink as I need.

Vitamin D levels go up faster when one is taking enough daily. For a few years I had shots of vitamin D3 every 3 months, 60,000iu per shot. Then I did oral vitamin D, 10.000iu daily (a different doctor). 1,000iu is a toddler dose. Vitamin D3 is dosed by body weight. My first blood test years ago was a level of 3!!! (Canadian numbers) I need to be up around 150-200 to feel good and have less joint and muscle pain.