According to the latest study, Ipriflavone may lower protective T cells by 15%.  K2 is a better choice for bone health than Ipriflavone. MK-7 - Vitamin K2 as Menaquinone-7 - Jarrow Formulas - with Nattokinase and Natto Extract mk7$22.99 60: Softgels FREE AIR MAIL SHIPPING IN THE UNITED STATES! The statements made here have not been evaluated by the FDA. The foregoing statements are based upon sound and reliable studies, and are meant for informational purposes. Consult with your medical practitioner to determine the underlying cause of your symptoms. Copyright 1997-2009 Life Extension Vitamin Supplies and Life Extension Institute, Inc. All rights reserved.