Watermelon is often called a “natural Viagra” because it contains citrulline, a compound that may help the body produce nitric oxide, which supports blood flow. Researchers at Texas A&M University have noted that citrulline can help relax blood vessels by boosting nitric oxide levels.

However, health experts from the University of California, Los Angeles (UCLA) stress that watermelon is not a substitute for Viagra. The drug sildenafil (Viagra) is a clinically developed and tested treatment for erectile dysfunction, designed to work directly and reliably.

While watermelon can contribute to overall health as part of a balanced diet, its effects are mild compared to medical treatments. Scientists agree that natural foods may support the body, but they do not replace approved medicines.