Vitamin D is essential for bone health; however, women receiving treatment for osteoporosis often receive no treatment for their low levels of vitamin D. Their vitamin D blood levels may go unchecked. Researchers tested the vitamin D levels of 1,537 community dwelling women who were postmenopausal and were receiving therapy (prescription drugs) for osteoporosis treatment or prevention. More than half of the women had inadequate levels of vitamin D. The authors concluded, "There is an unacceptably high level of vitamin D inadequacy among postmenopausal North American women receiving therapy to treat or prevent osteoporosis."
Holick MF and others. "Prevalence of Vitamin D Inadequacy among Postmenopausal North American Women Receiving Osteoporosis Therapy." J Clin Endocrinol Metab., June 2005;90(6):3215-24.