Alfieri is a certified fitness professional and a New York-based freelance writer specializing in health and fitness. She is the author of several fitness books and a frequent contributor to Let's Live magazine.

In this Users Guide, fitness professional and nutrition author RoseMarie Gionta Alfieri describes the most important supplements for improving mood, reducing irritability, and preventing depression. Among these supplements are the B-complex vitamins, GABA, and St. Johns wort. These and other nutrients have been shown scientifically to help people deal effectively with stress.