Calcitonin Salmon is a polypeptide hormone secreted by the ultimobranchial gland of salmon. It belongs to the calcitonin-like protein family and can be used to treat Paget's disease of bone, postmenopausal osteoporosis(fragile or brittle bones), or high levels of calcium in the blood (hypercalcemia). It appears to have actions essentially identical to calcitonins of mammalian origin, but its potency per mg is greater and it has a longer duration of action. It works mainly by Inhibiting osteoclastic bone resorption, decreasing serum calcium, and increasing renal excretion of phosphate, calcium, sodium magnesium and potassium by decreasing tubular reabsorption.