Vitamin of the B complex, occurring in milk, liver and yeast (6)

I believe the answer is:

niacin

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

I've seen this clue in The Independent.

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