Effect of oral contraceptives on total and bioavailable 25-hydroxyvitamin D

Frank Z. Stanczyk1,2, Intira Sriprasert2, Rachel Danis1, Raj Pandian3, Harpreet Matharu1, Nicole Bender1, Melissa Natavio1
1Department of Obstetrics and Gynecology, University of Southern California, Keck School of Medicine, Los Angeles, CA, USA
2Department of Preventive Medicine, University of Southern California Keck School of Medicine, Los Angeles, CA, USA
3Pan Laboratories, Irvine, CA, USA