I take the Yohimbe from GNC and also a tablet of Horny Goat Weed. It gives me good results wood-wise, though I’ve also experienced the jumpiness and the difficulty getting to sleep plus a touch of mild blurriness. Not as strongly as some others in this post but it’s there. I’m taking a break from PE at the moment but when I was active I limited my Yohimbe sessions to 2 a week. Any more than that I felt I was increasing the risk of side effects too much.