Hypothyroidism Supplement Question?

have hypotyhroidism. I discovered ThyroSense just before seeing a naturopath. He did a thyroid panel test and said my Synthroid was too little (.75mcg) and presribed 15mcg L-Thyronine T3 SR capsules as one a day medication starting today. ThyroSense has 250mg L-Tyrosine, 50mg Iodine and other supplements per capsule. I took 2 yesterday morning and felt slight palpitations for a little while, had 2 trips to the washroom more than normal but otherwise felt better overall. My naturopath claims his prescription is a T3 unlike ThyroSense and that it will work much better, I just have to gradually increase to my theutic dose. Aren't they both T3s?? I took the prescribed T3 capsule first time this morning and am feeling no significant difference like with the ThyroSense yesterday. Please help.