Concepts and practices related to nutrient supplement usage for young adults were compared to those of older adults in Colorado. Seventy-five percent of all respondents used nutrient supplements. The use of supplements was more prevalent among younger adults than older adults and most prevalent among young women. Multivitamins, iron, vitamins C and E were most often selected for improvement of energy and inadequate diets. Vitamin C was used to prevent colds and other illnesses. Vitamins A and E were used to benefit hair and nails. Young men and older women used supplements to prevent colds more often than older men and younger women. Other differences related to age and potential hazards of continued use of large amounts of certain vitamins and minerals are discussed.