Well let's break it down. . .
Aside from your normal Melatonin supplement, this has what appear to be boosters to the neurotransmitters in your brain, allowing more and faster movement of these chemicals throughout your nervous system.
I copped a bottle of 240 tablets 3mg Melatonin at Save Mart, they were selling them for 7 bucks.
You would be paying almost ten times that for half as much, plus shipping and handling, but hey you save twenty bucks!!!!
So in fact this stuff does not guarantee lucid dreams, nor will it force you to have them.
That is a skill you must acquire on your own.