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Quick google of "vitamin B5 diarrhea" had suggested (IIRC) that B5 can increase acetylcholine in the GI tract, stimulating activity... that's supposed to be at 2-10 grams a day, though...
Never heard of Gatorade causing this problem, but my son's diet is very odd and the B5 delta may have hit him or, more likely, the coincidence you mention Dr...
Thx again...