My husband had a short bout of struggling with ED a year ago. He's in his forties. We tried Cialis and such, but it was expensive and I was worried about regular use of those. So he bought a bunch of herbal supplements and they have worked really well. No problems whatsoever either getting or sustaining an erection in the past year, even with drinking, which used to always be an issue for him. I think he takes L-arginine.