This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. A substance, such as a vitamin or mineral, that is essential in minute amounts for the proper growth and metabolism of a living organism.

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

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

macronutrient   

nutrient    food   

sparklewater    document-level    folate    mid-year    transcarbamylase