Table 1. Patient demographics at baseline.

Variable	Group A (n=10)	Group B (n=10)	p-value
Age (y)	40.40±1.89	39.60±1.83	0.77
IIEF total	19.10±1.94	21.20±1.32	0.83
EHS	2.00±0.15	2.40±0.27	0.21
Duration of ED (mo)	14.68±7.54	49.79±17.67	0.14
On-demand PDE5i (S/T/V)	8/2/0	9/5/2	-

Values are presented as mean±standard error or number only.

Group A: received supplementation first, Group B: received placebo first, IIEF: International Index of Erectile Function, EHS: erection hardness score, ED: erectile dysfunction, PDE5i: phosphodiesterase type 5 inhibitor, S: sildenafil, T: tadalafil, V: vardenafil.