Vitamin in wheat germ (6)

I believe the answer is:

niacin

(Other definitions for niacin that I've seen before include "Type of vitamin" , "B vitamin which assists the nervous system" , "Another name for nicotinic acid" , "An essential B vitamin in Cain, strangely" , "Vitamin, nicitinic acid" .)

I've seen this clue in The Wall Street Journal.

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