[fictionman]

Watermelon may be a natural Viagra, says a researcher. That's because the popular summer fruit is richer than experts believed in an amino acid called citrulline, which relaxes and dilates blood vessels much like Viagra and other drugs meant to treat erectile dysfunction (ED).
"We have known that watermelon has citrulline," says Bhimu Patil, PHD, director of the Fruit and Vegetable Improvement Center at Texas A&M University, College Station. Until recently, he tells WebMD, scientists thought most of the citrulline was in the watermelon rind. "Watermelon has more citrulline in the edible part than previously believed," he says.
How could watermelon be a natural Viagra? The amino acid citrulline is converted into the amino acid arginine, Patil says. "This is a precursor for nitric oxide, and the nitric oxide will help in blood vessel dilation."