Dietary supplements (DSs) are considered by civilian and military personnel to be an effective method for improving mental and physical health status. The use of DSs is prevalent among U.S. civilians and Armed Forces personnel, with approximately 50% and 60%, respectively, being regular consumers of DSs. Both civilians and military personnel report a high level of confidence, 82% and 71% respectively, that DSs are safe and effective.

Military personnel use of DSs for a variety of reasons including compensation for presumed inadequacy of their diet, prevention of illness, improving mental health, increasing energy levels, and overcoming feelings of psychological stress. Similarly, civilians report the use of DSs to reduce physical and mental stress, anxiety, and fatigue, as well as to increase energy Despite these reports, little research has examined the relationship of DS use to psychological status, including mood, in healthy populations.

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