A vegetarian diet exclude meat, poultry, game, fish, shellfish or by-products of animal slaughter. A vegan diet can be viewed as the strictest form of vegetarianism. Therefore, a vegan diet not only excludes animal flesh, but also dairy, eggs and animal-derived ingredients. These include gelatin, honey, carmine, pepsin, shellac, albumin, whey, casein and some forms of vitamin D3.
As sometimes it can be difficult to identify clearly which foods do not contain animal ingredients, specific certification standards have been issued to verify and certify that a certain products does not contain ingredients of animal origin. Bioagricert has issued a specific certification called VEG_CERT that can be applied to food products.