l-carnitine in a day supplementation at doses of 2–4 g/day has been shown randomized, double-blind, placebo-controlled trial by Salvatore Benvenga to reverse and prevent symptoms of iatrogenic hyperthyroidism in women receiving TSH-suppressive levothyroxine Lean Sauce L-Carnitine | Pump
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doi: 10.2147/CMAR.S188661

Minamiyama Y, Takemura S, Ichikawa H

Vagus Nerve Stimulation and Its Benefits Vagus Nerve dysfunction typically results from a low vagal tone index, so stimulating the Vagus Nerve can operate as a treatment for the signs, symptoms, and diseases listed above

W.BullockT
