Nandrolone undecylate is primarily used in medical settings for the treatment of anemia, osteoporosis, and muscle wasting conditions associated with chronic illnesses such as cancer or AIDS. It helps stimulate red blood cell production, improving oxygen delivery to tissues, which is particularly beneficial for patients with chronic anemia. Additionally, it aids in increasing bone density, making it useful for individuals suffering from bone loss or osteoporosis. It is also prescribed to support muscle recovery and growth in patients experiencing muscle wasting due to chronic illnesses or severe trauma, and it plays a role in post-injury or post-surgical recovery by accelerating wound healing and tissue repair. Outside of medical use, it is sometimes utilized in sports and bodybuilding for its anabolic effects, though this is not its intended purpose. It should be used under medical supervision to avoid potential side effects.