The effect of three years of vitamin D supplementation on erectile dysfunction: Results from the randomized placebo-controlled D-Health Trial

Abstract

Background & AimsErectile dysfunction is common among older men and has been associated with low serum 25-hydroxy vitamin D concentration. However, this association may be due to uncontrolled confounding, and there is a paucity of evidence from interventional studies. We aimed to examine the effect of vitamin D supplementation on the prevalence of erectile dysfunction, in an exploratory analysis using data from a large randomized controlled trial. MethodsThe D-Health Trial recruited Australians aged 60-84 years between January 2014 and May 2015 and randomly assigned them to supplementation with 60,000 IU of vitamin D or placebo per month for up to 5 years. Blood samples were collected annually from randomly selected participants (total N=3943). We assessed erectile dysfunction at the end of the third year of follow-up. We used log-binomial regression to examine the effect of vitamin D on the prevalence of erectile dysfunction overall, and within sub-groups. ResultsOf the 11,530 men enrolled, 8,920 (77.4%) completed the erectile dysfunction question and were included in the analysis. After three years of supplementation, the mean serum 25-hydroxy vitamin D concentration was 76 nmol/L (standard deviation (SD) 24.94) in the placebo group and 106 nmol/L (SD 26.76) in the vitamin D group (p<0.0001). The prevalence of erectile dysfunction was 58.8% and 59.0% in the vitamin D and placebo groups, respectively (prevalence ratio 1.00, 95% CI 0.97, 1.03); there was no evidence of an effect of vitamin D in any subgroup analyses. ConclusionSupplementing older men with vitamin D is unlikely to prevent or improve erectile dysfunction. Clinical Trials Registry(ACTRN12613000743763)