The Australia New Zealand Food Authority (ANZFA) has called for cholesterol-reducing phytosterols to be banned as an ingredient in foods, claiming that they are not necessarily safe for children or women who are pregnant or lactating. Evidence that phytosterols inhibit the absorption of beta-carotene has made them popular as a food ingredient that can also reduce cholesterol. They have also been clinically proven to alleviate arthritis and improve the immune system.