Crossword Genius

In biology, a substance such as vitamin C, vitamin E or beta carotene (11)

Ross

I believe the answer is:

antioxidant

(Other definitions for antioxidant that I've seen before include "Something that might inhibit rust" , "what may slow down decline" , "Protective substance in food" , "ingredient in superfoods" , "Beneficial substance in some foods" .)

I've seen this clue in The Independent.
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