The thyroid affects every function in the body because it controls metabolism. Thyroid hormones regulate the entry of oxygen into the cells, thus controlling metabolic rate, body temperature, brain maturation in neonates, heart rate, hair growth, ovulation, skin turnover, growth and development. Additionally, thyroid increases protein synthesis.

Thyroid stimulating hormone (TSH) is produced by the pituitary gland in the brain and stimulates the thyroid gland. Thyroid hormones play a crucial role in normal cardiovascular function.

Thyroid is best absorbed when taken in the morning on an empty stomach. Thyroid medication should be taken at least 4 hours apart from medications that influence absorption of thyroid hormones.