PTH and osteoporosis: The other form of PTH, PTH (1‐84), is a recombinant single‐chain, 84‐amino acid polypeptide identical to that of full‐length endogenous PTH.8 Recently, analogues of PTH‐related protein (PTHrP), an abundant factor in bone that shows N‐terminal homology with PTH, have also been investigated for osteoporosis treatment in preclinical and clinical studies.9 Both teriparatide and, to a lesser extent, PTH (1‐84) have been investigated in postmenopausal women with primary osteoporosis in large‐scale randomized trials and open‐label extension studies.