Colorado State Extension has a great fact sheet on dietary supplements, vitamins, and minerals. 

Here are some quick facts from that article:
Most individuals can obtain all the vitamins and minerals needed to meet the recommended dietary allowances and adequate intakes by eating a variety of foods.Dietary supplements, including multivitamins and multiminerals, do not guarantee protection against disease.Large doses of either single nutrient supplements or high potency vitamin and mineral combinations may be harmful.Although vitamin deficiency is rare, it may occur when nutrients are limited in one’s diet, or as a result of a secondary deficiency caused by tobacco, alcohol use, or disease.Consult a medical professional before taking any self-prescribed single nutrient supplements.In this fact sheet, you will find:
What are dietary supplements?Who may need to consider a supplement?Choosing a supplementHealth risks Myths/facts related to supplementsCommon nutrients and their food sources
Link to Dietary Supplements: Vitamins and Minerals 



Colorado State Extension has a great fact sheet on dietary supplements, vitamins, and minerals. 

Here are some quick facts from that article:
Most individuals can obtain all the vitamins and minerals needed to meet the recommended dietary allowances and adequate intakes by eating a variety of foods.Dietary supplements, including multivitamins and multiminerals, do not guarantee protection against disease.Large doses of either single nutrient supplements or high potency vitamin and mineral combinations may be harmful.Although vitamin deficiency is rare, it may occur when nutrients are limited in one’s diet, or as a result of a secondary deficiency caused by tobacco, alcohol use, or disease.Consult a medical professional before taking any self-prescribed single nutrient supplements.In this fact sheet, you will find:
What are dietary supplements?Who may need to consider a supplement?Choosing a supplementHealth risks Myths/facts related to supplementsCommon nutrients and their food sources
Link to Dietary Supplements: Vitamins and Minerals