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L-carnitine is a more common form of carnitine

W., Ashikaga T., Terrien E

Thyroglobulin is a sensitive measure of both deficient and excess iodine intakes in children and indicates no adverse effects on thyroid function in the UIC range of 100-299 mug/L: a UNICEF/ICCIDD study group report

The carnitine shuttle is essential to prevent accumulation of long chain fatty acids and long chain acyl-CoAs which can be deleterious to cells [1, 43, 54]

Using all of these supplements helps support thyroid hormone conversion, immune function, thyroid hormone production, thyroid hormone cellular sensitivity, gut-related activation of thyroid hormone, detoxification, and the adrenal-thyroid connection