noun
something that completes or enhances something else when added to it
verb
to add an extra element to something in order to complete or enhance it
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It is recommended to take a vitamin supplement to ensure you are meeting your daily nutrient requirements.
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I like to take a protein supplement after my workouts to help with muscle recovery.
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I heard this new supplement is supposed to give you tons of energy, I gotta try it!
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Kindness is like a supplement for the soul, it nourishes and strengthens it.