An endless array of vitamin and mineral supplements are available to health-conscious consumers today, and an increasing number of individuals have incorporated these supplements into their daily routines. Unfortunately, their use is often inspired by rumor rather than sound medical advice. The results of clinical research on these supplements' effectiveness are often inconclusive while some studies have even shown negative health effects from overuse. Instead of relying on media hype and often-conflicting "word-of-mouth" information, people who take nutritional supplements need an...