As long as I remember i have taken supplements of one sort or another, I only have to read how good various supplements are and I have to buy them, so much so it's an obsession, and the bottom line is i have never felt the benefits of what they claim.
Only last week i bought 6 months' supply of Focus Pro which claims to help with energy and concentration, and they state within 30 minutes you will feel the benefits, well, i can tell you now, four days later i have felt absolutely nothing.
The only recent thing that seems to work is Valerian Root as an aid to sleep, it really has made a difference.
But of course with taking so many supplements its impossible to know what's good and what's rubbish.