Which hormone is not produced by the anterior pituitary gland?

The hormone that is not produced by the anterior pituitary gland is anti-diuretic hormone (ADH). ADH is primarily synthesized in the hypothalamus and then transported to the posterior pituitary gland for storage and release into the bloodstream. In contrast, growth hormone, luteinizing hormone, and thyroid-stimulating hormone are all secreted directly by the anterior pituitary gland. Understanding the distinction between these two parts of the pituitary is essential, as the anterior pituitary is responsible for producing and releasing several key hormones that regulate various physiological functions, while the posterior pituitary primarily stores and releases hormones made in the hypothalamus. This classification helps clarify the roles of different hormones in the endocrine system.