When they order a meal that ends up containing celery or parsley, many Americans can do little more than stare at it. Is it a garnish? Are you supposed to eat it? While the idea of eating these greens may be unsavory, researchers are saying that these veggies and the dietary supplements made from them may contain a valuable compound.

Research published in the journal Cancer Prevention Research announced that celery, parsley and certain fruits and nuts contain apigenin, a molecule that has been found to reduce the rate of breast cancer growth in laboratory animals with the disease.

In particular, researchers noticed that the compound slowed the rate of tumor cell growth caused by the hormone medroxyprogesterone acetate. While the latter substance encourages the formation of new blood vessels leading to tumors, apigenin appeared to prevent this process, which is called angiogenesis.

“It’s probably a good idea to eat a little parsley and some fruit every day to ensure the minimal amount,” said co-author Salman Hyder. “However, you can also find this compound in pill supplements in the health food section of many stores.”

Besides consuming more celery and parsley, individuals who want to stay healthy and adequately may consider taking a daily multivitamin as part of their eating regimen.