can propionyl-l-carnitine cause hypothyroidism 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 Role of carnitine in disease
Role of carnitine in disease Nutrition & Metabolism Springer Nature Link Carnitine HealthyPlace Propionic Acidemia New England Consortium of Metabolic Programs Frontiers Association between fatigue, peripheral serotonin, and L carnitine in hypothyroidism and in chronic fatigue syndrome
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