FAIRFIELD, N.J.--(BUSINESS WIRE)--The U.S. Food and Drug Administration (FDA) has approved the use of a new clone for the manufacture of calcitonin, the active ingredient in Fortical®, Unigene Laboratories, Inc.’s (OTCBB: UGNE, http://www.unigene.com) nasal spray product for the treatment of osteoporosis. This is the second improvement to the production process approved by the FDA this year. The combination of these improvements is expected to increase batch yields of the product by a factor of three.