When I bought the more recent bottle I also gave one to a friend. I took the entire bottle, but no, not all at once. I think he still has his over a year later. He might have tried it once or twice. It seems fair to say he didn't really try it.
I've tried subliminal and hypnosis sessions for lucid dreaming, too. And guided meditations for wake-induced lucid dreams. Buying crystals and putting them next to my bed seems like a comparatively weak effort, but I did that, too.
Also, although I have some rough periods with dream recall, I have been trying to write them down since 2014. It isn't like I'm not trying to put in the work the right way.