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  1. Briefel, Ronette R. DrPH, RD


National nutrition surveys in the United States indicate that about 1 in 2 infants or preschoolers and 1 in 3 school-aged children use at least 1 vitamin and mineral supplement, typically a multivitamin. Among users, adolescents are most likely to use 2 or more supplements, often a vitamin/mineral or multiple vitamin supplement plus single vitamins.