Carnitine and Thyroid Disease page 1 Life Extension LiquiCarn for Dogs and Cats L Carnitine Supplement VetRxDirect If you are like a lot of people, you may have never heard of carnitine but this important nutrient is critical for our body's ability to optimally burn fat required for energy. Hyperthyroidism: Diagnosis and Treatment AFP Altered carnitine acylcarnitine profiles in levothyroxine treated congenital hypothyroid patients with fatigue: An LC MS MS based study from Bangladesh PLOS One