 However, the U.S. Food and Drug Administration (FDA) has published studies showing that there is no direct link between parabens and breast cancer.Although this remains unproven, it is also believed there is a link between Aussie products and cancer due to the ingredient Cocamidopropyl Betaine, as seen in animal tests.Aussie Mega Shampoo also contains chemicals that have not been certified or assessed for safety by The Cosmetic Ingredient Review (CIR).