Michael A. Smith, M.D., is the senior health scientist and online personality for Life Extension, the world's leading organization dedicated to extending the healthy human life span. He is an author and blogger, creates and conducts webinars, and appears in informational health and wellness videos. He was a recurring guest on The Suzanne Show with Suzanne Somers on the Lifetime Network, appeared on Gem of the Caribbean, and is seen in several regional infomercials as an expert guest. He hosts Healthy Talk radio on www.RadioMD.

com. Sara Lovelady is a professional health writer specializing in nutritional supplements. She has written numerous health-related articles for both print and websites, including Delicious Living, Aisle 7, Healthy Living, Holistic Primary Care, WholeFoods, Nutrition Business Journal, and Natural Foods Merchandiser.