Not a joke, I used it for a while a few years back. Enhanced pump? Yeah. Tried various doses, if I come across them in my notes I will post. Ratioed with a lot of water. Sickly sweet.
Can't remember why I stopped but if the effect was that impressive I would not have so that should tell ya something. I don't think I've ever recommended it to anyone.
Edit - Just remembered that I heard about it here, use the search function "glycerine"