Parathyroid hormone peptides and parathyroid hormone-related protein peptides and methods of use

Provided herein are Parathyroid hormone (PTH) peptides and parathyroid hormone-related protein (PTHrP) peptides (e.g., PTH analogs, PTHrP analogs), and related variants, chemical derivatives, fusion polypeptides, multimeric polypeptides, and peptidomimetics, peptoids, the like. Also provided are their use in methods for activating the PTH receptor in a cell (e.g., an osteoblast), methods of treating a subject with bone loss (e.g., by administration of a PTH peptide or PTHrP peptide (e.g., a PTH analog or PTHrP analog)), methods of ameliorating a symptom associated with osteoporosis in a subject, methods of retarding the progression of osteoporosis in a subject, and methods of regenerating bone in a subject.