L-Citrulline Improves Sexual Performance: 50% Chance of Improvement with just 1.5g/day

You probably receive the same amount of daily spam mails trying to refer you to dubious viagra retailers somewhere on the Cayman Islands, or wherever else in the world. In case, you ever even thought about ordering stuff like that, you may as well consider getting some l-citrulline from your local supplement store first.

Scientistsfrom the University of Foggia in Italy (Cormio. 2011) have found that supplementation with as little as 1.5g/day l-citrulline improved erection hardness in men with mild erectile dysfunction (and I always thought Italian men would not have any erection problems ;-):
Significant improvement in the EHS [erection hardness score] from 3 to 4 was reported by 2 (8.3%) of the 24 men when taking the placebo and 12 (50%) of the 24 men when taking L-citrulline (P < .01). The mean number of intercourses per month, a nonvalidated patient-reported outcome we have commonly used in patients treated for ED, was 1.37 ± 0.93 at baseline, 1.53 ± 1.00 at the end of the placebo phase (P = .57), and 2.3 ± 1.37 at the end of the treatment phase (P < .01). For treatment satisfaction, all 12 patients reporting an EHS improvement from 3 to 4 scored very satisfied, and the remaining 12 scored not satisfied and all asked for a PDE-5 inhibitor prescription at the end of the study phase. Finally, no AEs [adverse events] occurred.
So, this is a 50% chance of improvement. In view of the price of l-citrulline (as bulk-powder) it would be worth a try. I promise, I won't tell anyone ;-)
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