The most common cause of hypothyroidism worldwide is insufficient intake of iodine, a mineral found in iodized salt and some foods (such as seafood and dairy) that is needed for production of How Thyroid Supplements Work & Why They Help you Feel Better L Carnitine ((R) Carnitine) Co factor for oxidation MedChemExpress 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. Acetyl L Carnitine