Do Vitamin D Levels Affect Antibody Titers Produced in Response to HPV Vaccine? Antibody Titers Produced in Response Authors: Zimmerman RK1, Lin CJ, Raviotta JM, Nowalk MP. Abstract In addition to its well-known effects on bone metabolism, vitamin D is an immunomodulating hormone. Serum vitamin D levels in males 18-25 years were measured at baseline, and HPV […]