micronutrient

/ˌmaɪkroʊˈnutriənt/
noun
  1. A vitamin or mineral that the body needs in very small amounts to stay healthy.
    • A balanced diet provides all the micronutrients your body requires.
    • Iron and zinc are important micronutrients for growth and development.
    • Micronutrient deficiencies can lead to serious health problems.
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