Sulforaphane improves endothelium-dependent and H2O2-induced relaxations in human vascular tissue. Relaxation induced by acetylcholine (ACh, A-B) and H2O2 (C–D) in human penile resistance arteries (HPRA, A, C) and human corpus cavernosum (HCC, B, D) from patients with erectile dysfunction (ED) and from organ donors without erectile dysfunction (No ED). The influence of adding sulforaphane (SFN, 10 μM) on such responses in HPRA and HCC from ED patients is shown. Data are expressed as mean ± SEM of the percentage of maximal relaxation induced by papaverine (0.1 mM). n indicates the number of patients. ***p < 0.001 vs. No ED and ††† vs. ED by two-factors ANOVA test.