The invention relates to a method for increasing the toughness and/or stiffness of bone and/or reducing the likelihood and/or severity of bone fracture by administering a parathyroid hormone. The method can be employed to increase toughness or stiffness of bone at a site of a potential or actual trauma,...http://www.google.com/patents/US20040033950?utm_source=gb-gplus-sharePatent US20040033950 - Method of increasing bone toughness and stiffness and reducing fractures