Has anyone tried the 17-hd by vyotech yet? GNC is actually giving out free samples with a coupon but i'm sure if you talk to them they will give you a free sample anyways. However i tried this and i was a bit skeptical about an "explosive power surge in a matter of minutes" due to an increase of testosterone after a single dosage but i was very impressed. While looking up information about it i wasn't sure whether it was a product that helped your body naturally produce more testosterone of if excess testosterone was implemented by the 17-hd or if it freed up more free testosterone that your body already has. Well the question is does anyone know anything about this product, side effects, and after cycling this product is there a need for pct? Thanx guys.