Just found something that may be of interest to you.
https://www.reddit.com/r/Nootropics/comments/5drbat/ltheanine_large_dose_discontinuationwithdrawal/
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That’s definetely been my experience. You gotta taper off it if you’re taking large amounts.
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Nope i never had any form of withdrawel from it.
I was taking large amounts of it and i just stopped didnt feel a thing
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I think if you take anything that relieves a symptom(s) and stop it there will be discomfort, obviously if the symptom(s) you wanted to go away come back you won’t like it (feel well).