Does anyone have nay personal expereince with testerone boooster.?

I am looking fro some input from people who have actually used testerone boosters like the ones you can get form GNC. I have been taking them for 5 days adn just feel energy boost, I have not had enjoyed yet the sexual effects of it yet. Are there any suggestions you have for me or horror stories from using this stuff so I can stop while I am ahead and how long will it take till I see the full effects of this stuff?