The study by Reeve, Meunier, Parsons, Bernat, Bijvoet, Courpron, Edouard, Klenerman, Neer (left), Renier, Slovik (middle), Vismans, and Potts (right) raised a paradox (5). Hyperparathyroidism is characterized by bone loss, yet PTH is also anabolic — is it possible that short doses of PTH or its analogs could be used to treat osteoporosis?