Calcitonin, human, is primarily used in the treatment of bone disorders. It helps regulate calcium levels in the body by inhibiting bone resorption, making it effective in managing conditions like osteoporosis, Paget's disease, and hypercalcemia. By reducing the activity of osteoclasts, it promotes bone density and strength, particularly in postmenopausal women who are at higher risk of bone loss. Additionally, it is sometimes used to alleviate bone pain associated with these conditions. Calcitonin is administered via injection or nasal spray, depending on the specific medical need.