I’ve only been using the stack for a few days now but I have to say that I noticed a significant decrease in my night wood. Morning wood is OK but I usually have really good night wood. I suspect the the L-Arginine but haven’t narrowed it down. Somehow it seems unlikely that its Lecithin or Zinc. I know that it’s not the Pygeum since I didn’t start that for a couple of days. Don’t know about cum volume yet since I’m going to give it about 5 days to work.