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Wiktionary
essential nutrient

n. (context nutrition English) A compound that must be obtained from food for survival

Wikipedia
Essential nutrient

An essential nutrient is a nutrient required for normal physiological function that cannot be synthesized by the body (e.g., niacin, choline), and thus must be obtained from a dietary source.

Usage examples of "essential nutrient".

What if something here on Grass turned around an essential nutrient?