Hey,
The technical term for these are relaxation drinks, and in for lucid dreaming they act just like melatonin + vitamin B6. That combo is very potent for dream enhancement, while everything else is fluff. I even considered starting my own beverage company focused on dream enhancing drinks with the ingredients above.

In terms of a lucid aid, it is way too pricy for that. That can probably cost you 2-4$, and it's a one time deal. At the same time a bottle of melatonin +vitamin B6 would cost you <20$ and have about 100 doses, so 0.2$ per dose or 10-20 times cheaper.