Healthy hair is easy to recognize and is generally full bodied, shiny, lustrous, and free of flakes and damage. Unhealthy hair can result from overprocessing and, more importantly, inadequate nutrition or disease processes. Although graying hair or loss of hair as a result of aging is not considered a pathological process, the lack of color or hair loss does counter one’s perception of healthy hair and is somewhat connected to environmental exposure to oxidants and ultraviolet (UV) radiation (Lu et al. 2009). To understand how vital nutrients are to healthy hair, a quick synopsis of hair biology is in order to ground the discussion.