An amino acid found naturally in watermelon and other plants, important for blood vessel function and athletic performance.
From Latin 'citrullus' (watermelon, from 'citrus') plus the chemical suffix '-ine'—named citrulline because it was first isolated from watermelon, combining the plant source with biochemical naming conventions.
Citrulline is why eating watermelon on a hot day actually helps your blood vessels relax—it's a natural performance enhancer that athletes are now taking as supplements, all hidden inside summer fruit!
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