It always works!
I've been taking VOLUME since late August, and I've never once had a bad batch. I'll never forget when it first kicked in after a while, and I woke up with the best morning wood I've ever had in my life! No exaggeration. I like to make my VOLUME last, so I only take it when I need it or I'm in the mood, but it gets the job done. I'll admit it does work better for me when I use it consistently, though.