If you're seeking fuller lips with over-the-counter lip enhancers, you may be disappointed, according to a new study.

In a small study of seven women using an over-the-counter lip enhancer, researchers at the University of Washington Medical Center's Cosmetic Surgery Center found that the product did not produce any lip enhancement.

The findings are published in the May/June issue of the Archives of Facial Plastic Surgery.

The women used a lip enhancement for one to four months, and digital before-and-after photographs were used to compare the lip measurements. The study found that no statistically significant change in lip size was detected in the women.

"It should be noted that these patients were all quite motivated to try this product," Dr. Sam Most, the study's author, said in a news release.

He said that no adverse affects were noted, but only one of the seven women said she would use the product again.

"In many cases, these products are sold at the cosmetic counter or on the Internet as effective without scientific study, and consumers should be wary of them," Most said.

There are a number of proven methods of lip augmentation, including filler injections and surgery, he said.