T3
I wouldnt take t4 to help out with endo t3 this will eventually make the problem worse...t4 increases rT3 levels which in turn will reduce T3 level even more..NOT what you want!
If you are looking for natural supps to help i would suggest, adequate protein, iodine, selenium, guggul, inc omega 3 efa's, lowering omega 6 efa's, B complex, taurinecalcium, vit a, d
Peace,
P