MetabolStim (was MetabolSlim) by Biogenesis Nutraceuticals 

MetabolStim was formulated to support peripheral conversion of T4 (thyroxin) to T3 (triiodothyronine).

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B Complex vitamins are involved as cofactors in many chemical reactions. They are often called coenzymes. In addition to enhanced protein and carbohydrate metabolism, B vitamins can enhance cellular respiration by supporting optimal mitochondrial function.

Minerals like the B vitamins are directly involved in cellular metabolism and healthy mitochondrial function. Iodine directly supports thyroid hormone production. Selenium and to a lesser degree Zinc are important for T4 to T3 conversion by supporting the activity of the enzyme 5’deiodinase. Vanadium has been shown to support the thyroid and a healthy metabolism.

Amino Acids fulfill many beneficial functions. Some like N-Acetyl LCysteine (NAC) can act as antioxidants protecting delicate mitochondrial membranes from oxidative damage. NAC along with Selenium are part of the deiodinase enzyme responsible for conversion of T4 to T3. Others, like N-Acetyl L-Tyrosine (NAT) are important in thyroid hormone production.