One of the best non steroidal enhancer L Carnitine It's far more superior than oral form of L carnitine. I personally tried it after studying about its facts. It worked for me. Frontiers Association between fatigue, peripheral serotonin, and L carnitine in hypothyroidism and in chronic fatigue syndrome L Carnitine Injections VITAstir Clinic Does L Carnitine help manage hyperthyroidism symptoms? Consensus Vitamins to be taken away from thyroid medication Use nitric oxide to tame Hashimoto's hypothyroidism Carolinas Thyroid Institute