Thyroid Stimulating Hormone (TSH) is a critical hormone produced by the pituitary gland. It plays a crucial role in the endocrine system by regulating the function of the thyroid gland. TSH prompts the thyroid to produce and release thyroid hormones, primarily thyroxine (T4) and triiodothyronine (T3), that are essential for regulating metabolism, growth, and overall energy balance. In the toxicology context, TSH levels can be indicative of exposure to various endocrine disruptors.