Amino Acid That Regulates Blood Flow

This page is the CodyCross answer for the clue below from Rainforest, Group 1208, Puzzle 1 (Teak and Mahogany).

Question is: Amino Acid That Regulates Blood Flow

and the answer is: ARGININE

Word Meaning:

ARGININE — An amino acid found in animal foods that plays an important role in several physiological processes.

Definitions from Wiktionary.