B Complex helps with the absorption of B12, and fish oil and cod liver oil complement each other.
Levothyroxine did not work for me Talkin peace and I gave it a ten year effert! I'm now on T3 Liothyronine, but my blood tests showed several deficiencies. Apparently the majority of underactive thyroid patients are lacking in iron and Vitamin D. Vitamin C helps with the absorption of thyroid medication, anything acidic does.
I've decided on a skeleton form of my usual protocols, it's only two days a week, so I've halved what I usually take.