Just because something is natural doesn't always mean it's safe. Tap the link in bio to explore what the research says about how certain supplements and substances may interact with breast L carnitine supplementation for the management of fatigue in patients with hypothyroidism on levothyroxine treatment: a randomized, double blind, placebo controlled trial. Semantic Scholar Is it safe to take L carnitine with levothyroxine (thyroid medication)? If you've been diagnosed with Graves' disease, you may be wondering about treatment options. The three main approaches for treating hyperthyroidism are antithyroid medications, radioactive iodine therapy, and thyroidectomy (surgery). Each option How Much L Carnitine Per Day: Dosage Tips and Benefits