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Pyruvate
In modest amounts it not much of anything. In large doses you'll get in trouble on account of the sweetness and calories in it.
more modest, most modest
Cinderella is modest because in the movie she always was modest
The word 'modest' is an adjective, a word used to describe a noun.
Adjectives do not have singular and plural forms.
Adjectives have degrees: modest, more modest, most modest.