I have recently found out I have renail insufficient since 2009. I have acute kidney failure in 2013. Since obtaining ,you medical records, my GOD have been steady at 34. I have recently been to a first visit with a nephhrologisy. My primary care put me on Vito do for the rest of my life, & added alendronatesodium sodium. Upon research, I think it is contraindicated for renal failure. No one has suggested calcium for me. Your adive, please TV Linda