Black watermelon seeds contain fatty oil, protein, vitamin B2, pentosan, starch, crude fiber and α-amino-β-(pyrazolyl -N) propionic acid. It also contains urease, α-galactosidase, β-galactosidase and sucrase. It also contains a saponin-like component named Cucurbocitrin, which has antihypertensive effect and can relieve the symptoms of acute cystitis.
Watermelon seeds can lower blood pressure and help prevent arteriosclerosis, so patients with hypertension can eat them regularly. Watermelon seeds have the function of clearing away lung heat and resolving phlegm, and have auxiliary effects on cough and hemoptysis. Watermelon seeds are rich in oil and have the functions of invigorating stomach and relaxing bowels.