A piece of sweet, sweet juicy watermelon is a crown for fourth of July and a meal means that researchers have effects similar to Scifil tablets - but do not necessarily expect to keep the fireworks all night.

Watermelons contain an ingredient called citrulline that can trigger production of a compound that helps relax blood vessels of the body, similar to what happens when a man takes Scifil, said scientists in Texas, a leading producer of seeds of the variety.

Found in meat and rind of watermelons, citrulline reacts with enzymes in the body when consumed in large quantities and is converted into arginine, an amino acid that benefits the heart and the circulatory and immune system.

"Arginine stimulates nitric oxide, which relaxes blood vessels, the same basis as Scifil to treat erectile dysfunction and even prevent it," said Bhimu Patil, a researcher and director of the Texas A & M Fruit and Vegetable Improvement Center. "Watermelon may not be as organ specific as Scifil, but it is a great way to relax blood vessels without the side effects of drugs."

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