You can wake up from SP quite easily actually, just change your breathing and you'll snap out of it. The feeling might be uncomfortable but it's an amazing opportunity to DEILD if you end up in one. Don't let your fear of something completely natural which might seem scary, control you.
Almost every time I take a pill, I wake up 1 hour or 1½ hour after falling asleep. I'm either in REM then or my dream cycle has just ended. Choline is used with other supplements to enhance the effects.
I think you're overrating these supplements

They're not wonderpills that'll ensure you go lucid, they just enhance all the factors that makes dreaming enjoyable. Clarity, length, stability and recall. It also ups your chances of actually getting lucid but if the intentions and belief isn't there, chances are you're not going to get lucid. Placebo
Good luck! Please report back once you've done it.
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