I've heard that certain vitamins can help with lucid dreaming. What I DON'T want are vitamins that will make my dreams more vivid. I don't want my dreams to start becoming more vivid until I've learned to control them, because vivid dreams have the potential to be much more frightening.

So basically, I want vitamins that'll help me lucid dream without making my dreams more vivid. And if it's impossible to find a vitamin that accomplishes this, I'd prefer one that increases the vividity of my dreams as little as possible while still increasing the lucidity.