Name of the Third B Vitamin

This page is the CodyCross answer for the clue below from Hobbies, Group 1420, Puzzle 5 (Parachuting).

Question is: Name of the Third B Vitamin

and the answer is: NIACIN

Word Meaning:

NIACIN — (organic chemistry, biochemistry) A water-soluble vitamin, a component of vitamin B complex, found in meat, yeast, and dairy products; it is essential to metabolism.

Definitions from Wiktionary.