The FDA will evaluate the study before its results are released to the public. Many pet food manufacturers still use ethoxyquin. However, because of public concern, many others have switched to other ways of preserving their food. Propionates, calcium propionate and sodium propionate, were recently evaluated by the FDA and although massive doses of these preservatives did kill lab rats, the FDA labeled them safe. Germany, however, has banned propionates.
Propionic acid is a fatty acid that exists naturally in everything from apples to wood pulp.
It flavors food and it inhibits mold growth. Recent research shows propionic acid to be a safe preservative. When used in food, sodium nitrate can produce carcinogenic substances called nitrosamines. Accidental ingestion of sodium nitrate by humans can be fatal. Experts have not said whether sodium nitrates are fatal to birds, but all recommend caution.