ACTH 1-13 is primarily used in medical and research settings for its role in stimulating the adrenal cortex to produce and release corticosteroids. It is often employed in diagnostic tests to assess adrenal gland function, helping to identify conditions such as Addison's disease or Cushing's syndrome. Additionally, it is utilized in research studies to investigate the hypothalamic-pituitary-adrenal axis and its regulatory mechanisms. In some cases, it may also be explored for its potential therapeutic effects in neurological or inflammatory disorders due to its influence on cortisol production.