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 antibody titers were measured one month following the third quadrivalent HPV vaccine dose. Vitamin D levels were >30 ng/ml […]