Eye disease supplement found to have anti

An over-the-counter supplement used to treat an eye disease has been found to potentially have anti- cancer properties.

The dietary supplement slowed tumour growth and boosted the effects of immunotherapy to destroy cancer in tests on mice.

Susan Rau has been taking a supplement every day for the past 10 years to slow the progression of her macular disease, which impacts up to two million Australians.

"My mother had late stage macular disease and she had lost quite a lot of her central vision as a result," Rau told 9News.

One of the key ingredients is zeaxanthin.

It's found naturally in dark leafy vegetables and many other foods including corn, tangerines and egg yolks.

That same nutrient, commonly used to protect vision, could also help the immune system fight cancer.

Rese