Vitamin C improves the abnormalities in serum free T4, T3, and TSH concentrations in those with hypothyroidism and GI dysfunction.

B6 and B12 supplementation help regulate homocysteine levels (elevated levels are linked with hypothyroidism).

Glutathione is involved in the conversion of T4 into metabolically active T3, responsible for the majority of thyroid activities.

Zinc is crucial for proper thyroid hormone metabolism.

Carnitine supplementation raises carnitine tissue levels which are depleted in thyroid disorders and contribute to muscle fatigue.