Erectile Dysfunction is usually a result of not getting enough blood flow to the penis so by increasing the blood flow to the penis you can get more erect.
Garlic does contain allicin, which improves blood flow so Garlic can help with erectile dysfunction and help men get a much larger penis during intercourse.
Just like Viagra helps to increase blood flow to the penis so does Garlic but you may need to eat more garlic to get the affect than you would taking Viagra but Garlic is a healthier way to fix erectile dysfunction than Viagra.