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Answer for the clue "A substance needed only in small amounts for normal body function (e.g., vitamins or minerals) ", 13 letters:
micronutrient

Word definitions for micronutrient in dictionaries

WordNet Word definitions in WordNet
n. a substance needed only in small amounts for normal body function (e.g., vitamins or minerals)

Wiktionary Word definitions in Wiktionary
n. A mineral, vitamin or other substance that is essential, even in very small quantities, for growth or metabolism

Wikipedia Word definitions in Wikipedia
Micronutrients are nutrients required by organisms throughout life in small quantities to orchestrate a range of physiological functions. For people, they include dietary trace minerals in amounts generally less than 100 milligrams/day – as opposed to macrominerals ...

Usage examples of micronutrient.

Like many micronutrients hailed as magic bullets, isoflavones have been isolated and put into pill form.

She doused her tree with micronutrient spray and cleaned out the dead wood.

Their insights into medicine and healing, especially in the micronutrient and dietary recommendations, brought this book into focus.

Fruits and vegetables contain far more of these micronutrients than high-density carbohydrates like grains and starches.

Iraq as well as for micronutrients, vitamins and medicines for its malnourished and disease-stricken populace.

Liquid water as a solvent for micronutrients and for carbon dioxide, hydrogen as a source of energy for the fixation of carbon dioxide into organic molecules.

There were the macronutrients—carbon, oxygen, hydrogen, nitrogen, phosphorus, sulfur, potassium, calcium, and magnesium— then the micronutrients, including iron, manganese, zinc, copper, molybdenum, boron, and chlorine.

There were the macronutrients—carbon, oxygen, hydrogen, nitrogen, phosphorus, sulfur, potassium, calcium, and magnesium—then the micronutrients, including iron, manganese, zinc, copper, molybdenum, boron, and chlorine.

There were the macronutrients-carbon, oxygen, hydrogen, nitrogen, phosphorus, sulfur, potassium, calcium, and magnesium then the micronutrients, including iron, manganese, zinc, copper, molybdenum, boron, and chlorine.