Vitamin D and Erectile Dysfunction
Erectile dysfunction (ED) is largely a vascular disease — endothelial dysfunction driven by the same processes that cause coronary and peripheral atherosclerosis. Vitamin D deficiency is a modifiable factor in endothelial dysfunction; correcting it may modestly improve ED alongside evidence-based management.
Observational data
Adults with ED have lower mean 25(OH)D than age-matched controls in multiple studies. NHANES data (Farag 2016) found deficient men had 32% higher odds of ED. The Bologna cohort found deficient men had more severe ED and worse penile Doppler flow measures.
Mechanisms
- Endothelial function — vitamin D deficiency associates with reduced flow-mediated dilation and increased oxidative stress; correction can improve endothelial biomarkers.
- Testosterone — vitamin D-deficient men may have modestly lower testosterone; correction sometimes helps in the truly deficient (see testosterone page).
- Cardiovascular risk factor overlap — hypertension, diabetes, dyslipidaemia, and obesity all cluster with vitamin D deficiency and drive ED.
Supplementation trial evidence
Small RCTs (Canguven 2017) reported IIEF-5 (International Index of Erectile Function) improvement with vitamin D correction in deficient men. Sample sizes are small and blinding was limited. No large trial has established vitamin D as a first-line ED treatment.
What actually works for ED
- PDE5 inhibitors (sildenafil, tadalafil, vardenafil, avanafil) — first-line pharmacotherapy.
- Cardiovascular risk factor management — BP, lipids, glycaemic control, smoking cessation.
- Weight loss and regular aerobic exercise — meaningful improvements in mild-moderate ED.
- Address depression and anxiety.
- Vacuum devices, intracavernosal or intraurethral prostaglandin, or penile implant for refractory ED.
- Vitamin D correction is a low-cost adjunct, not a stand-alone treatment.
ED as cardiovascular warning
New-onset ED in middle-aged men should prompt cardiovascular risk assessment — endothelial dysfunction in penile arteries typically precedes coronary artery disease by 3–5 years. This is a valuable early-warning signal that matters more than any vitamin question.