Vitamin D deficiency and erectile dysfunction: emerging mechanisms and clinical challenges
Abstract
The recent study by Olivencia et al., published in the British Journal of Pharmacology, clarifies important mechanisms underlying the relationship between vitamin D deficiency and erectile dysfunction (ED). Vitamin D2 (ergocalciferol) and D3 (cholecalciferol) undergo two hydroxylation steps to become the active form, calcitriol (1,25-dihydroxyvitamin D). Calcitriol exerts its effects by activating the vitamin D receptor (VDR), which is expressed in multiple tissues, including the penile vasculature and the smooth muscle cells of the corpus cavernosum. Using both human samples and animal models, the authors show convincing evidence that a lack of vitamin D or the absence of its receptor (VDR) significantly impairs erectile function. This study introduces a novel pathway involving oxidative stress and the secretory leukocyte protease inhibitor (SLPI), which could help explain why certain patients fail to respond adequately to first-line therapies, such as phosphodiesterase type 5 inhibitors (PDE5i).1 Epidemiological studies show that lower serum 25-hydroxyvitamin D levels are associated with increased ED prevalence. Lower vitamin D concentrations also correlate strongly with more severe ED symptoms, reinforcing the clinical relevance of this connection.2 Clinical research further suggested that vitamin D supplementation might enhance the efficacy of PDE5i treatments. For instance, combined vitamin D and tadalafil treatment reportedly improved erectile function and sexual…
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