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 Acetyl L-Carnitine | Integrative Therapeutics®
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Studies related to Narcolepsy, including its pathophysiology and treatment Studies related to Epidemiology, Pathophysiology, Diagnosis, and treatment of Restless leg Syndrome

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

Li S, Li Q, Li Y, et al

Efficient Fat-to-Energy Conversion: L-Carnitine transports long-chain fatty acids into mitochondria for ATP energy production, fueling workouts and active metabolism