synthroid acetyl-l-carnitine L-carnitine supplementation at doses of 2–4 g/day has been shown in a randomized, double-blind, placebo-controlled trial by Salvatore Benvenga to reverse and prevent symptoms of iatrogenic hyperthyroidism in women receiving TSH-suppressive levothyroxine How Does Carnitine Support Hashimoto's?
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Individual results vary

Chandler RJ, Zerfas PM, Shanske S, Sloan J, Hoffmann V, DiMauro S et al

Cell 140 , 4961 (2010)

It's essential to consult with a healthcare provider to determine if they're right for you and to ensure proper dosage and administration
