Synthetic polypeptide with (1-34) amino acid at N-terminal region of the parathyroid hormone (PTH) with similar biological activity to PTH. PTH peptides found in breast milk and seem to be related to the excretion of calcium in milk. At last update no published data on excretion in breast milk were found . A high molecular weight and rapid metabolism (Tmax and T1 / 2) make it unlikely excretion into milk in significant amount. The low oral-bioavailability makes drug levels in the infant's plasma from ingested breast milk be nil or negligible, except in premature babies and/or immediate neonatal period when they may exhibit an increased intestinal absorption.