Thyroid Stimulating Hormone (TSH) is one of three hormones secreted by the anterior lobe of the pituitary gland. Its primary function is to stimulate the thyroid gland to produce thyroxine (T4) and triiodothyronine (T3). These essential thyroid hormones, T3 and T4, are vital for regulating the body's metabolic rate – the process by which food is converted into energy. They also play crucial roles in maintaining proper heart and nerve functions, supporting brain development, muscle control, and bone health.