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The document specifies the definitions and technical criteria to be fulfilled for foods and food ingredients to be suitable for vegetarians (including ovo-lacto-, ovo- and lacto-vegetarians) or vegans as well as for food labelling and claims. It is applicable to business-to-business communication (B2B), to the food trade, and to food labelling and claims. The definitions and technical criteria apply only post-harvest/collecting. It does not apply to human safety, environmental safety, socio-economic considerations (for example, fair trade, animal welfare), religious beliefs and the characteristics of packaging materials. The text of ISO 23662:2021 has been prepared by Technical Committee ISO/TC 34 "Food products" and has been taken over as EN ISO 23662:2023 by Technical Committee CEN/SS C01 "Food products". The responsible national standardization committee is Working Committee NA 057-08-03 AA "Vegane, vegetarische und pflanzenbasierte Lebensmittel" ("Vegan, vegetarian and plant-based foods") at DIN Standards Committee Food and Agricultural Products (NAL).