Vitamin B6 is well known to increase vivid dreaming and causing nightmares (1). Perhaps there may be a link to the brain glutamate levels and B6. Glutamate is an excitatory neurotransmitter and which may help performance in autistic or ADHD. However over activation at night may be cause of nightmares as well. There are reports of Chinese Food Syndrome and nightmares among other symptoms all being related to MSG or excessive glutamate. This seems to be an interesting possible early side effect of excessive B6 intake.
Sources:
1/ Ebben M1, Lequerica A, Spielman A.. Effects of pyridoxine on dreaming: a preliminary study. Percept Mot Skills. 2002 Feb;94(1):135-40.
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